feat: examples

ex/theme-06-colours/practice-03.md

@@ -2,6 +2,8 @@
 
 ### Exercise 7. Choose the correct word
 
+Example: apple / banana -> apple
+
 1. 🍇 = purple / black
 2. 🐻 = brown / pink
 3. 🎈 = red / grey
@@ -9,6 +11,8 @@
 
 ### Exercise 8. Complete the word
 
+Example: r e _ -> red
+
 1. p u r p _ e
 2. p i n _
 3. b r o w _
@@ -16,6 +20,8 @@
 
 ### Exercise 9. Match
 
+Example: 1 -> b
+
 1. balloon
 2. jacket
 3. boat