完成句子（共7小题，每空0.5分，满分10分）
71. 如果你想知道如何翻译这个句子，你最好查字典。
If you want to know how to translate this sentence, you had better ______ ______ a dictionary.
72. 努力提高工人的工作条件是值得做的事情。
It is _______ to_______ working _______ for factory workers.
73. 很明显，他在尽力屏住呼吸。
It was _______ that he was trying to ______ his ______.
74. 他已经负债很久。对他来说，如何谋生成了个大问题。
He has been ______ ______ for a long time. How to earn ______ _______ is a big problem.
75. 既然我们已经完成了设计，就该轮到公司进行建设了。
_______ _______ we have finished the design, the company in its turn, will do the _______.
76. 她的衣着和行为证实了我的猜想——她确实很富有。
Her clothes and behavior _______ my guess ______ she was quite wealthy.
77. 使用过多的化肥导致了严重的问题。
_______ too much chemical fertilizer ______ ______ serious problems.
