diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..67e15a5d 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -13,6 +13,7 @@
 let a;
 console.log(a);
 
+variable a is not assigned to a value
 
 // Example 2
 function sayHello() {
@@ -22,6 +23,7 @@ function sayHello() {
 let hello = sayHello();
 console.log(hello);
 
+sayHello is a function that has not been defined nor does it have a return value or a parameter
 
 // Example 3
 function sayHelloToUser(user) {
@@ -31,6 +33,10 @@ function sayHelloToUser(user) {
 sayHelloToUser();
 
 
+sayHelloToUser does not have a parameter therefore user has no value
+
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+
+console.log is calling index 3 however there are only 2 as the index starts at 0
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..f2440f83 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,7 +6,15 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+ let myArray = [0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20];
+ let i = 0;
+ let str = "";
+    while (i < n) {
+       str += myArray[i] + ","; 
+       i++;
+    }
+   console.log(str);
+   // TODO
 }
 
 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..5fda23d3 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,6 +17,13 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
+    let i = 0;
+    while (i < birthdays.length) {
+   if (birthdays[i].includes("July")) {
+    return birthdays[i];
+   }
+   i++;
+}
     // TODO
 }
 
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..b514522d 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -7,7 +7,19 @@
 */
 
 function evenNumbersSum(n) {
+    evenNumArray = [0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22];
+    let i = 0;
+    let sum = 0;
+    do {
+        sum += evenNumArray[i];
+        i++;
+
+    }
+    while (i < n) {
+        return sum;
+    }
     // TODO
+
 }
 
 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..b6558e7b 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -11,4 +11,8 @@ 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..7322cd50 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]}`);
+}
 
 /*
 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..db629964 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -11,6 +11,16 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (tubeStation of tubeStations) {
+    console.log(tubeStation);
+}
+
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+let word = " ";
+
+for (let i of str) {
+    word = i.trim();
+    console.log(word.toUpperCase());
+}
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..950d56a3 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -10,6 +10,14 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
+    let number = generateRandomNumber();
+    let i = 0;
+    do {
+     number += i;
+     i++;
+    }
+    while (i < 50);
+    return number;
     // TODO - implement using a do-while loop
 }