21. There is a big sale in the supermarket. When the door opens, people r                 into it.

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. I can't find him because I don't know his a                 and phone number.

25. Tony s                 electing Joyce to be the chief editor because she had experience.

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

--- It faces south.

27. That's c                (正确的).

28. I beg your p                 because I have no idea about your words.

29. It's i                 to point at others.

30. There's an u                 Dinosaur World in the museum.

31. I saw some students r                 out of the classroom after class.

32. Miss. Zhang lives in the center of the city and it's c                 for her to go shopping.

33. You are a good boy and you should speak to the old people p                .

34. I want to send Jim a letter. But I don't know his a                .

35. Look, the expression on his face s                 that something bad must have happened to him.

36. I can't find the correct d                . Where is the north?

37. His answer is wrong, but yours is c                .

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

39. Talking loudly in public places is i                .

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

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

42. Taking a taxi in the city is very                 (方便的)