feat: examples

ex/theme-06-colours/practice-01.md

@@ -4,6 +4,8 @@ Source style: matching, spelling, and choosing.
 
 ### Exercise 1. Match
 
+Example: 1 -> b
+
 1. red
 2. blue
 3. green
@@ -18,6 +20,8 @@ e. 🍓
 
 ### Exercise 2. Complete the word
 
+Example: r e _ -> red
+
 1. r e _
 2. b l _ e
 3. g r e e _
@@ -26,6 +30,8 @@ e. 🍓
 
 ### Exercise 3. Choose the correct colour
 
+Example: Look at the task and write the answer.
+
 1. The sun is yellow / black.
 2. Grass is green / purple.
 3. Snow is white / orange.