24、_______ he had not hurt his leg, John would have won the race.

A. If                 B. Since                C. Though           D. When

23、After two years' research, we now have a _______ better understanding of the disease.

A. very                B. far                   C. fairly               D. quite

22、Speaking of all the songs he has written, I think this is probably his _______ one.

A. better-known       B. well-known             C. best-known           D. most-known

21、If Joe' s wife won' t go to the party, _______.

A. he will either        B. neither will he           C. he neither will  D. either he will

20、At the beginning of class, the noise of desks _______could be heard outside the classroom.

A. opened and closed                  B. to be opened and closed   

C. being  opened    and  closed       D. to open and close

19、I have _______ all my papers but I still can't find my notes.

A. looked through        B. looked for            C. looked after           D. looked out

18、-I'm sorry to have kept you waiting.

- _______, Bill.

A. You' re welcome       B. Go ahead            C. Don't  mention   it     D. No problem

17、— Is there anything wrong. Bob? You look sad.

---Oh, nothing much. In fact, I ______ of my friends back home.

A. have just thought            B. was just thinking            

C. would just  think             D. will just be thinking

16、Some people choose jobs for other reasons _______ money these days.

A. for            B. except              C. besides             D. with

15、_______ matters most in learning English is enough practice.

A. What            B. Why                 C. Where            D. Which