18、If we work hard, we can overcome any difficulty, ____ difficulty it is.

A. what         B. how          C. whatever        D. however

17、Could you please tell me where you bought the shoes you ________ yesterday?

A. had on         B. put on           C. pulled on           D. tried on

16、Most animals have little connection with___ animals of ___ different kind unless they kill them for food.

A. the ; a          B. × ; the         C.   ×; a         D. the ; the

15、Years ago we didn’t know this, but recent science _____ that people who don’t sleep well soon get ill.

A. showed            B. has shown           C. will show           D. is showing

14、After three months, these young students finally became used to the ______ of life in a big city abroad.

A. speed          B. pace                  C. rate                   D. frequency 

13、---You were tired after the 10,000-meter race．weren’t you?

--- Yes,           I was out of breath．

A．not at all         B．not a little            C．not really          D．not a bit

12、Some medicine，when wrongly           ，can kill a person

A．taken          B．taking          C．take           D．to take

11、--- Can I look at the menu for a few more minutes before I decide?

--- Of course._______ sir.

A. Make yourself at home                B. Enjoy yourself

C. Take your time                     D. It doesn't matter

10、I don’t doubt           our team will win the 4×100-meter race．

A．when         B．whether         C．that            D．which

9、It was a pity that the great writer died________ his works unfinished.

A. for          B. with           C. from             D. of