feat: examples

ex/theme-12-classroom-phrases/practice-05.md

@@ -2,6 +2,8 @@
 
 ### Exercise 13. Choose the answer
 
+Example: a) Yes, it is. b) Yes, they are. -> a)
+
 1. Teacher: Open your book.  
    a) OK. b) Blue.
 2. Teacher: Look at the board.  
@@ -11,6 +13,8 @@
 
 ### Exercise 14. Write the correct phrase
 
+Example: You want to ask politely. -> Excuse me.
+
 1. You do not understand.  
    __________________________
 2. You want the teacher to say it again.  
@@ -20,6 +24,8 @@
 
 ### Exercise 15. Match the object and the word
 
+Example: 1 -> b
+
 1. eraser
 2. notebook
 3. pencil case