31. In order to celebrate my twentieth birthday, I should buy at least twenty __________. (蜡烛)

32. It will cost the boy over $300 __________ for the operation. (pay)

33. Do you have any trouble __________ in public fluently? (speak)

34. After a long walk, the boys all felt like_________ a good rest. (have)

35. Not my parents but I __________ interested in sports programs. (be)

36. It’s a long way to cover. It’s your turn ___________ next road. (drive)

37. It’s rude ___________ in before others when waiting for the bus. (push)

38. What can you do to keep it from __________ again? (happen)

39. There are different kinds of _____________ in the world. (organize)

40. If you don’t warm up before taking exercise, you will risk _______ yourself. (hurt)