We can’t afford to waste the 　　　 (宝贵) time.

---What do you think of teaching, Bob?

---I find it fun and challenging. It is a job___ you are doing something serious but interesting.

A. where B. which C. when D. that　

You’ll have to ________ your paper carefully before you ________

A: look at, hand in it　 B. look up, turn in it

C. look on, give it in D. look through, turn it in

_____ the teacher couldn't understand was______fewer and fewer students showed interest in his class.

A. What; that　 B. All that; because 　 C. Why; that　　 D. What; why

Is oxygen the only gas _______ helps fire burn?
A. that B. / C. which D. it

Don’t worry if you don’t understand everything, the teacher will ______ the main points at the end.
A. recover       B. review       C. require      D. remember

With all his money and friends　　　 , he was now in great despair (绝望).

A. going 　　 B. gone 　　 C. be gone　 D. had gone

American country music is ____ and popular with young people.

　 A. highly thought of　　　　　　　 B. high thought

　 C. highly thought　　　　　　　　 D. high thought of

Mary’s father is _____ in arts and she is _____ in writing. Last year she held her arts show _____.

A. success; successful; successful 　 B. a success; successful; successfully

C. a success; successful; successful 　 D. a success; successfully; successfully