29 A. on
30 B. by
31 C. performance
32 C. goals
33 How often does Minh brush his teeth?
34 How does Simon have a lot of pain nown?
35 How đi you feel after eating that food?
36 What did Nga do last week?
37 Brush your teeth after meals
38 Don't play soccer in the street
39 Wash and iron your own clothes
40 Don't eat too much candy.