五、词汇。用所给单词的正确形式填空。

41. He refused _________ (do) the housework.

42. She ________ (explanation) the reason for being late.

43. The bird in the cage has beautiful__________ (feather).

44. We need several different _______ (knife) to make paper cutting.

45. I'm very pleased _______ (see) you.

46. I am very ________ (frighten) with snakes. Don't let me see them.

47. The plane landed on the _________ (land) site three hours ago.

48. There is something ________ (write) on this piece of paper.

49. Our teacher asked us not _________ (talk) to each other in class.

50. I heard a man _______ (speak) outside the house at that time, but I didn't know who he was.