A)　 改写下列句子(每小题1分，共5分)

76. You are all here. Let’s start the meeting. (用since连成一句)

　 _______________________________________________________.

75. As the earthquake was strong, all the walls began_____________.

74. The birds flew______________ when they heard the big sound.

73. I saw a piece of glass _____________ when I walked past the office.

72. When we heard the strong noise, we looked at each other___________.

71. I was late for school and I tried __________, but it didn’t work.

70. The little girl ____________(shouted loudly) when she saw the snake.

C)选用所给词组的正确形式填空.( 每小题1分，共5分)

　fall down, in a great hurry, come down, in fear, make an excuse

69. The temperature will __________(become lower)to 3℃ tomorrow. You’d better wear more clothes.

68. A _____________(暴雨) hit Nanjing last Sunday.

67. Look, the snow is very heavy and it______________(覆盖) everything.