80.…I can’t see the words on the wall clearly.

　　　 …Why not put on your g______？

79.The mother thanked the soldiers for s______ her son’s life

78.The number 100,000,000 reads a m______

77.Go straight a ________the street and don’t turn left until you reach the third crossing.　

76.The children haven’t had anything to eat for over 10 hours. They must be h_____

75.The factories get the river ______(脏) than ever before and more and more fish in it　 have died one after　 another.

　 (B)根据句子意思，写出空缺处各单词的正确形式，首字母已给出。

74.One of his _______(牙)fell out when he ate something hard.

73.The children looked _______(高兴)at their teacher and asked for more stories.

72.Everyone was __________(惊奇)to hear the news that the lazy boy had passed the exam.