36.　　 There are sixty m_____ in an hour, And there are 24 hours in a d______.

35.　　 It t_______ me half an hour to do my homework every day.

34.　　 If you have a cold, you should _________(吃) some medicine.

33.　　 He goes to the supermarket　 o____ a week.

32.　　 Boys are always a_______ in PE classes.

31.　　 We must _________ (保 持 ) our classroom clean.

30.　　 Can I help you?----Of c_____, I’d like a hamburger, please.

29.　　 The weather here is so cold, I can h______ stand it.

28.　　 Grandpa is pretty healthy because he e_____ every day.

27.　　 ______(睡觉) eight hours a night is good for your health.