diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..d7bc9542 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -11,12 +11,12 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a); //a is not defined 
 
 
 // Example 2
 function sayHello() {
-    let message = "Hello";
+    let message = "Hello"; //the function doesn`t assigned to a value 
 }
 
 let hello = sayHello();
@@ -26,11 +26,11 @@ console.log(hello);
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
-}
+} //the functin doesn`t have return value 
 
 sayHelloToUser();
 
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]); //there is no [3]index just 0,1,2
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..9ae75be4 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -7,6 +7,14 @@
 
 function evenNumbers(n) {
     // TODO
+    if (n > 0)
+    let x = "";
+    let i = 0;
+    while (i < n) {
+        x = x + "," + i * 2:
+        i++;
+    }
+    console.log(x.slice(1, x.length));
 }
 
 evenNumbers(3); // should output 0,2,4
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
index d584cd75..59f95f4c 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,7 +17,15 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+  // TODO
+  let i = 0;
+  let birthday = "";
+  while (i < BIRTHDAYS.length) {
+    if (BIRTHDAYS[i].includes("July")) {
+      birthday = BIRTHDAYS[i];
+      return birthday;
+    }
+    i++;
 }
-
-console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
+};
+console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..1c552495 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -8,6 +8,15 @@
 
 function evenNumbersSum(n) {
     // TODO
+  let total = 0;
+  let i = 0;
+  do {
+    if (i % 2 === 0) {
+      total += i;
+    }
+    i++;
+  } while (i < n * 2);
+  return total;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
index db5fac64..94211c08 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,12 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+// 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));
-    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..63aa9463 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,6 +27,9 @@ 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..a30e7add 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -8,9 +8,19 @@ let tubeStations = [
     "Baker Street",
     "Picadilly Circus",
     "Oxford Street",
-    "Tottenham Court Road"
+    "Tottenham Court Road",
 ];
+function outputStations(array) {
+    for (let i = 0; i < array.length; i++) {
+      console.log(`${array[i]}`);
+    }
+  }
 
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+function outputStations(array) {
+    for (let i = 0; i < array.length; i++) {
+      console.log(`${array[i]}`);
+    }
+  }
\ No newline at end of file
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..5291b9e3 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -13,6 +13,15 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let stringOutput = [];
+  for (let i = 0; i < cities.length; i++) {
+    stringOutput.push(
+      `The temperature in ${cities[i]} is ${temperatureService(
+        cities[i]
+        )} degrees`
+        );
+    }
+    return stringOutput;
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..dfd28047 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -11,6 +11,11 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let x = 0
+  do {
+    x = generateRandomNumber()
+  } while (x <= 50)
+  return x
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..d676be7a 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -6,6 +6,7 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+    return allArticleTitles.filter((article) => article.length <= 65)
 }
 
 /*
@@ -15,6 +16,12 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    let result = allArticleTitles[0]
+  for (let i = 0; i < allArticleTitles.length; i++) {
+    if (allArticleTitles[i].split(' ').length < result.split(' ').length)
+      result = allArticleTitles[i]
+  }
+  return result
 }
 
 /*
@@ -24,14 +31,21 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    return allArticleTitles.filter((article) => article.match(/(\d+)/))
 }
 
 /*
     The Financial Times wants to understand what the average number of characters in an article title is.
     Implement the function below to return this number - rounded to the nearest integer.
 */
+const reducer = (previousValue, currentValue) => previousValue + currentValue
+
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    return Math.round(
+        allArticleTitles.map((article) => article.length).reduce(reducer) /
+          allArticleTitles.length,
+      )
 }
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..723af79d 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -33,8 +33,15 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Solve the smaller problems, and then build those solutions back up to solve the larger problem.
         Functions can help with this!
 */
+const reducer = (previousValue, currentValue) => previousValue + currentValue
+
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    return closingPricesForAllStocks.map((priceList) =>
+    parseFloat(
+      (priceList.slice(priceList.length - 5).reduce(reducer) / 5).toFixed(2),
+    ),
+  )
 }
 
 /*
@@ -49,6 +56,10 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+    const result = closingPricesForAllStocks.map((priceList) =>
+    priceList.slice(priceList.length - 5),
+  )
+  return result.map((res) => parseFloat((res[4] - res[0]).toFixed(2)))
 }
 
 /*
@@ -65,6 +76,16 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    const result = closingPricesForAllStocks.map((priceList) =>
+    priceList.slice(priceList.length - 5),
+  )
+  return result.map(
+    (res, index) =>
+      'The highest price of ' +
+      stocks[index].toUpperCase() +
+      ' in the last 5 days was ' +
+      Math.max(...res).toFixed(2),
+  )
 }