diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..b8f7dfbe 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -12,6 +12,8 @@
 // Example 1
 let a;
 console.log(a);
+// it doesn't have value.
+
 
 
 // Example 2
@@ -21,6 +23,8 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
+//it doesn't return value
+
 
 
 // Example 3
@@ -28,9 +32,12 @@ function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
+
 sayHelloToUser();
+//it hasn't value for user parameter
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+ //array hasn't this value
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..280866af 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,9 +6,17 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let arr = [];
+    let i = 0;
+    while (i%2 === 0 && n > 0 && n > arr.length) {
+        arr.push(i);
+        i+=2;
+    }
+    return arr.toString();
 }
 
+console.log(evenNumbers(10));
+
 evenNumbers(3); // should output 0,2,4
 evenNumbers(0); // should output nothing
 evenNumbers(10); // should output 0,2,4,6,8,10,12,14,16,18
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
index d584cd75..8648b8c8 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -15,9 +15,13 @@ const BIRTHDAYS = [
     "September 28th",
     "November 15th"
 ];
-
 function findFirstJulyBDay(birthdays) {
-    // TODO
+  let i = 0;
+  while (i < birthdays.length) {
+    if (birthdays[i].startsWith("July"))
+     return birthdays[i];
+    i++;
+  }
 }
 
-console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
+console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
\ No newline at end of file
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..b090df10 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -6,9 +6,16 @@
     Using a do-while loop, write a function which returns the sum of the first n even numbers (starting from 0)
 */
 
-function evenNumbersSum(n) {
-    // TODO
-}
+ function evenNumbersSum(n) {
+   let sum = 0;
+   let i = 0;
+   do {
+     sum += i * 2;
+     i++;
+   } while (i < n);
+
+   return sum;
+ }
 
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
index db5fac64..c983d000 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,13 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
-    console.log(String.fromCharCode(97 + i));
-    i++;
+// let i = 0;
+// while(i < 26) {
+//     console.log(String.fromCharCode(97 + i));
+//     i++;
+// }
+
+for (let i = 0; i < 26; i++) {
+  console.log(String.fromCharCode(97 + i));
 }
 // The output shouldn't change.
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
index 081002b2..26096fd9 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,7 +27,10 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
+for(let i = 0; i < WRITERS.length; i++){
+    console.log(WRITERS[i] + " is " + AGES[i] + " years old.");
 
+}
 /*
 The output should look something like this:
 
diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
index 65585c6a..529e09f7 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -12,5 +12,14 @@ let tubeStations = [
 ];
 
 
-// TODO Use a for-of loop to capitalise and output each letter in the string seperately.
+for(let station of tubeStations){
+    console.log(station);
+}
+
+// TODO Use a for-of loop to capitalise and output each letter in the string separately.
 let str = "codeyourfuture";
+
+
+for (let letters of str){
+    console.log(letters.toUpperCase());
+}
\ No newline at end of file
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..ddbb3744 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,7 +12,11 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let report=[]
+    for(let i = 0; i < cities.length; i++){
+report[i]=`The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`;
+    }
+    return report;
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..d069c4cf 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -11,6 +11,14 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let counter=0;
+    do{
+       counter=generateRandomNumber();
+    }
+    while(counter<50);
+    return counter;
+
+
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..af41ef65 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -5,7 +5,12 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+       if(allArticleTitles.lengh !== 0){
+        allArticleTitles = ARTICLE_TITLES.filter((el) => el.length <= 65);
+        return allArticleTitles;
+    
+}
+else return allArticleTitles=[];
 }
 
 /*
@@ -13,8 +18,12 @@ function potentialHeadlines(allArticleTitles) {
     Implement the function below, which returns the title with the fewest words.
     (you can assume words will always be seperated by a space)
 */
+
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+  let arr = allArticleTitles;
+  let newArr = arr.sort((a, b) => a.length - b.length);
+  return newArr[0];
+
 }
 
 /*
@@ -23,7 +32,22 @@ function titleWithFewestWords(allArticleTitles) {
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+  let arr = [];
+
+  for (let moreClick of allArticleTitles) {
+    let choosen = "";
+    for (let letter of moreClick) {
+      if (!isNaN(letter) && letter !== " ") {
+        choosen = moreClick;
+        break;
+      }
+    }
+    if (choosen.length !== 0) {
+      arr.push(choosen);
+    }
+  }
+  return arr;
+
 }
 
 /*
@@ -31,11 +55,17 @@ function headlinesWithNumbers(allArticleTitles) {
     Implement the function below to return this number - rounded to the nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
-    // TODO
+  let total = 0;
+  let average = 0;
+  for (let articleTitle of allArticleTitles) {
+    total += articleTitle.length;
+  }
+  average = total / allArticleTitles.length;
+  return Math.round(average);
+  // TODO
 }
 
 
-
 /* ======= List of Articles - DO NOT MODIFY ===== */
 const ARTICLE_TITLES = [
     "Streaming wars drive media groups to spend more than $100bn on new content",
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..31f3370b 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -35,6 +35,21 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let newAverage =[]
+    let sum = 0;
+    for (let i = 0; i < CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS.length; i++) {
+      for (let j = 0; j < CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[i].length; j++) {
+        sum += CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[i][j];
+      }
+      newAverage.push(
+        (sum / CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[i].length).toFixed(2) *
+          1
+      );
+
+      sum = 0;
+    }
+   return newAverage;
+
 }
 
 /*
@@ -48,7 +63,12 @@ function getAveragePrices(closingPricesForAllStocks) {
     The price change value should be rounded to 2 decimal places, and should be a number (not a string)
 */
 function getPriceChanges(closingPricesForAllStocks) {
-    // TODO
+  // TODO
+  let newPriceChange = [];
+  for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+    newPriceChange.push((closingPricesForAllStocks[i][4] - closingPricesForAllStocks[i][0]).toFixed(2) * 1);
+  }
+  return newPriceChange;
 }
 
 /*
@@ -65,9 +85,19 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+   highestPrice =[];
+   for(let i=0; i < closingPricesForAllStocks.length; i++) {
+     let highestNum = closingPricesForAllStocks[i].sort(function(a,b){
+         return b-a;} )[0];
+         highestPrice.push(
+           "The highest price of " + stocks[i].toUpperCase() + " " + "in the last 5 days was " + highestNum.toFixed(2));
+
+   }
+   return highestPrice;
 }
 
 
+
 /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the average price for each stock", () => {
     expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(