21. There was little time left, so we had to r                 to school together.

22. My house is next to the bus station, so it's very c                 for me to take a bus.

23. Every one of us should speak to our parents p                .

24. Tell me your email a                 so that I can send emails to you.

25. The English program can s                 ways for us to take an interest in learning English.

26. --- Which d                 does your house face?

--- It faces south.

27. There is a mistake in the notebook; you should c                 it.

28. P                ? I can't hear you clearly. It's too noisy.

29. It's i                 to point at others.

30. It takes us only a quarter to get to the centre of Nanjing by u                .

31. Tom sat                 (在旁边) his mother all night at the party.

32. It is very                 (便利的；方便的) to pay by credit card.

33. Could you please help me to                 (改正) my mistakes?

34. Talking loudly in a library, a museum, or a movie theater is                 (不礼貌的).

35. Do you know his home                 (地址)?

36. Haikou is the                 (中心) city of Hainan Province.

37. Jim sits in the                 (角) of the classroom, on the right side.

38. You can park your car in the                 (地下的) parking.

39. Which                 (方向) is the bus coming?

40. We've got plenty of time; there's no need to                 (仓促).

41. 想知道这架飞机有多重是很困难的。

It's hard to know                             &n