17. How _______ do you brush your teeth? Twice a day.

A. many            

B. much               

C. often               

D. old

18. They are _______ football, now.

A. play               

B. playing             

C. watch              

D. watches

19. _______ sports does your brother play? Badminton and swimming

A. Who            

B. What                

C. How               

D. Which

20. What's the weather like in the _______? It's hot.

A. spring               

B. winter          

C. summer          

D. Fall