75. Everyone should take part in p_________ the environment.

74. Beijing is the c　　　　 　of China.

73. Your hands are so d______ again, go and wash them.

72. A q_______ is another way of saying fifteen minutes.

71.T　　　 　to his help, we could finish the work in time.

70.There were many old 　　　　　(发明) in the museum.

(B)根据下列句子所给英语首字母，写出句子空缺处各单词的正确形式(每空一词)。

69.Taiwan is the first　　　　　 　(大) of China.

68.The PRC was　　　　 　(成立) on October 1^st,1949.

67.Wash your hands before ____　 ___(吃) please.

　 (A)根据下列句子所给的汉语注释，写出句子空缺处各单词的正确形式(每空一词)。

66.June 1^st is 　　　　　(儿童) Day.