完成句子。
1.现在主要的困难在于找到一个好的机会。
Now the chief difficulty_____ ______finding a good ?opportunity?.
2.上个月的那场大春雨导致了洪灾。
The heavy spring rain last month_____ _____the flood.
3.这个问题被提交给了委员会。 The problem was_____ _____ the committee.
4.谋杀者终将有一天会为自己的罪行付出代价的。
The murderer will have to_____ ______his crimes one day.
5.对于我们来讲是时候该采取行动保护环境了。
It’s time for us______ _____ _____to protect the environment.
6.你必须戒烟,否则你可能会死于肺癌。
You have to_____ _____smoking,otherwise you may lung cancer.
7.我可以再提你在会议开始时所说的事情吗?
Can I_____ _____ _____what you said_____ _____ _____ _____the meeting?
8.实际上,大多数飞机不是晚点就是比时间表稍稍提前到达。
_____ ______,most planes either are delayed or arrive slightly_____ ______schedule.
9.这在当时好像起了一定作用,但没有根本解决问题。
This seems to have worked temporarily but the problem was_____ ______ _____
resolved_____ _____and all.
10.为了确定他在家,我事先打电话给他。
To_____ _____ _____ that he was at home,I called him up _____ ______. .
类药物的催眠作用机制是（）。