63. We use irons to make our clothes ________ (光滑).

62. These days our government is trying to clean up the ______ (污染的)rivers.

61.The programme started with a _______ (讨论)about the problem.

60. Even children know _________ (nation) Day.

B) 根据句意及汉语提示,写出各单词的正确形式，每空一词。

59. Why don’t you play an ________(enjoy) game with your baby?

58. Is it your turn ________ (sweep) the floor today?

57. It’s ___ (hope) for you to pass the exam if you give up learning it.

A) 根据句意,用括号中所给词的正确形式填空，每空填一词。

56. I won’t leave until my work ________ (finish) tomorrow evening.