It was quite a serious accident, ________ caused by careless driving.

A. which I think was　　 B. I think which was

C. which I think it was　 D. I think which it was

Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests.

A、before B、since C、when D、after

— My sons are not a little restless．

— Oh? Boys _______ be boys．

　 A．should B．can C．may D．will

The car slowly ______ its way up the mountain road.

A. wound 　 B. turned　 C. bent 　 D. took

The boy is often found _____in reading books.

A. absorbs 　　　　 B. is absorbed 　C. absorbing 　 　　D. absorbed

Will you see to ____ that my birds are looked after well while I’m away?

A、them　 B、yourself　 C、it D、me

_____ you may have, you should gather your courage to face the challenge.

A. however a serious problem B. what a serious problem

C. however serious problem D. what serious a problem

Scientists ________ in many ways for their contributions _______ the development and progress of human society.

A. always honour; to　　　　　　　　　　 B. always honour; for

C. are always honoured; to 　　　　　　　　 D. are always honoured; for

Don’t be so discouraged. If you ________such feelings, you will do better next time.

A. carry on　　　 B. get back　　　 C. break down　　 D. put away