diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..2376449d 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -9,12 +9,12 @@
     For each example, can you explain why we are seeing undefined?
 */
 
-// Example 1
+// Example 1- variable "a" has not been declared.
 let a;
 console.log(a);
 
 
-// Example 2
+// Example 2- no value inside function parantheses so it doesnt returned any value.
 function sayHello() {
     let message = "Hello";
 }
@@ -23,7 +23,7 @@ let hello = sayHello();
 console.log(hello);
 
 
-// Example 3
+// Example 3- the function has been called with empty parameter
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
@@ -31,6 +31,6 @@ function sayHelloToUser(user) {
 sayHelloToUser();
 
 
-// Example 4
+// Example 4- the index [3] does not  exist in Array list.
 let arr = [1,2,3];
 console.log(arr[3]);
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..673deb84 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -7,6 +7,17 @@
 
 function evenNumbers(n) {
     // TODO
+  let i = 0;
+  let numbersList = [];
+  while (numbersList.length < n) {
+    if (i % 2 === 0) {
+      numbersList.push(i);
+    }
+    i++;
+  }
+  console.log(numbersList.toString());
+        
+    
 }
 
 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..3dc40b9c 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -18,6 +18,15 @@ const BIRTHDAYS = [
 
 function findFirstJulyBDay(birthdays) {
     // TODO
+  arrayLength = birthdays.length;
+  let i = 0;
+  while (i < arrayLength) {
+    if (birthdays[i].includes("July")) {
+      return birthdays[i];
+    }
+    i++;
+  }
+
 }
 
 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..9793b4b3 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -8,6 +8,13 @@
 
 function evenNumbersSum(n) {
     // TODO
+    let sum = 0;
+    let i = 0;
+    do {
+    sum += i * 2;
+    i++;
+    } while (i < n);
+    return sum;
 }
 
 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..aa95bb19 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,8 +6,7 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+for (let i = 0; i < 26; i++)  {
     console.log(String.fromCharCode(97 + i));
     i++;
 }
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
index 081002b2..18c8cd44 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,7 +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..25ec436e 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -14,3 +14,6 @@ let tubeStations = [
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (let i = 0; i < str.length; i ++) {
+    console.log(str[i].toUpperCase())
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..8ef36089 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -13,6 +13,12 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let temperatureReport = [];
+    for (city of cities) {
+    let cityTemp = temperatureService(city);
+    temperatureReport.push(`The temperature in ${city} is ${cityTemp} degrees`);
+    }
+    return temperatureReport;
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..e70055c5 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 number;
+  do {
+    number = generateRandomNumber();
+  } while (number <= 50);
+  return number;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..9c9c4d5a 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -6,6 +6,15 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+    let headlines = [];
+
+    for (let eachTitle of allArticleTitles) {
+    if (eachTitle.length <= 65) {
+    headlines.push(eachTitle);
+    }
+    }
+
+    return headlines;
 }
 
 /*
@@ -15,6 +24,19 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    let leastWordsTillNow;
+    let headlineWithLeastWords;
+
+    for (let eachHeadline of allArticleTitles) {
+    let numberOfWords = eachHeadline.split(" ").length;
+
+    if (leastWordsTillNow === undefined || leastWordsTillNow > numberOfWords) {
+    leastWordsTillNow = numberOfWords;
+    headlineWithLeastWords = eachHeadline;
+    }
+    }
+
+    return headlineWithLeastWords;
 }
 
 /*
@@ -24,6 +46,15 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    let headlineTitlesWithNumbers = [];
+
+    for (let eachHeadline of allArticleTitles) {
+    if (headlineTitleHasNumbers(eachHeadline)) {
+    headlineTitlesWithNumbers.push(eachHeadline);
+    }
+    }
+
+    return headlineTitlesWithNumbers;
 }
 
 /*
@@ -32,6 +63,13 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let characterTotal = 0;
+
+    for (let eachTitle of allArticleTitles) {
+    characterTotal += eachTitle.length;
+    }
+
+    return Math.round(characterTotal / allArticleTitles.length);
 }
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..34dd6fe6 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -35,6 +35,18 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let average = [];
+    let stockSum = 0;
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+    stockSum = 0;
+    for (let j = 0; j < closingPricesForAllStocks[i].length; j++) {
+    stockSum = stockSum + closingPricesForAllStocks[i][j];
+    }
+    average.push(
+    Number((stockSum / closingPricesForAllStocks[i].length).toFixed(2))
+    );
+    }
+    return average;
 }
 
 /*
@@ -49,7 +61,16 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
-}
+    let priceChangeArr = [];
+
+    for (price of closingPricesForAllStocks) {
+        let priceChange = Number((price[price.length - 1] - price[0]).toFixed(2));
+        priceChangeArr.push(priceChange);
+      }
+      return priceChangeArr;
+    }
+
+
 
 /*
     As part of a financial report, we want to see what the highest price was for each stock in the last 5 days.
@@ -65,6 +86,12 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    highestPriceLast5Days = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        highestPriceLast5Days.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${Math.max(...closingPricesForAllStocks[i]).toFixed(2)}`);
+    }
+    return highestPriceLast5Days;
+
 }