338. In class, we should ___ what the teacher is saying.

A. concentrate on　　 B. concentrate in　 C. pay attention on　　 D. put our heart on

337. Don’t be afraid to ___ the test, for ___ is　 ___ mother of success.

A. failure, fail. /　　 B. fail , failure, the　　 C. fail, failure, /　　 D. fail, the failure, the

336. Don’t ask others __ help. You should do it ___ your own.

A. for, on　　 B. to ,　 on　　 C. for, in　　 D. for, of

335. We must be strict ____ ourselves and we must be also strict-___our study.

A. at, with　　 B. with, in　　 C. with, on　 D. in , with

334. The work must ___　 ___ 5:00 this afternoon.

A. finish, by　 B. be finished, by　 C. be finished, since　　 D. finish, at

333. The question is ____ . We have ___ to solve it.

A. easy enough, enough tome　　 B. enough easy, enough time

C. easily enough, time enough　　 D. enough easily, time enough

332. I don’t quite agree ___ the plan, but I agree ____ the date of our meeting.

A. with , to　 B. to , with　 C. to , on　　 D. on , to

331. The students on duty should get the classroom ____.

A. clean　　 B. cleaned　　 C. cleaning　　 D. to clean

330. You aren’t　 allowed ____ here. We don’t allow____.

A. to smoke, to smoke　　　　 B. smoking, to smoke

C. smoking, smoking　　　　 D. to smoke, smoking

329. They did not ___ what I said, they only ___ God.

A. believe, believed in　　　　　　 B. believe in , believed

C. believed, believe in　　　　　　 D. believe in , believe