25．医生们尽了最大的努力来挽救这个老人的生命，但最终还是徒劳。

The doctors did what they could to save the old man，but________ ________.

[答案]　in vain

24．母亲出去了，让孩子们在房间里做作业。

The mother went out，________her children________their homework in their room.

[答案]　leaving；doing

23．他们拒绝付款是毫无理由的。

________ ________ ________ ________for their refusing to pay.

[答案]　There was no reason

22．这场暴风雪横扫了这个国家的北部地区。

The snowstorm________ ________the northern areas of the country.

[答案]　swept through

21．我们应当尽早地阻止这场传染病的传播。

We should manage as soon as possible to________the epidemic________ ________ ________.

[答案]　stop；in its tracks

20．We’d better reach the airport half an hour before the plane________________.

[答案]　takes off

19．If you want to succeed，you must________________in yourself.

[答案]　have faith

18．It is not right to sit________________during a group discussion.

[答案]　in silence

17．Have you________________who broke the glass last night?

[答案]　found out

16．It was your carelessness that ________________your final failure.

[答案]　led to