78. The new bridge has been in use since 2005. (对划线部分提问)

________ _________ has the new bridge been in use?

77. She has already finished her homework. (改成否定句)

She _______ finished her homework _________.

六、根据要求完成句子 5%

76. I don’t know how I can work out the problem.（保持句意不变）

I don’t know __________ _________ work out the problem.

75.-Where is your mum, Sandy?

　 - She _________ some food and drinks for the party in the kitchen now

74. You don’t understand what he said. Never mind! I _________ it for you.

73．— What do you think of my answer to the question?

—Sorry. What’s that? I _____________ about 　something else.

72.They 　________ about two thousand words in the past few years.

71．I ________ to 　Shanghai the day before yesterday to save more time.

70. Help _______ to some fish, children.

69. Jack is very happy　 because 　today is his ________ birthday.