13. Buses have routes . They ________ and ________ people at different people on the routes.

A. take on; get off B. pick up ; drop off C. take up ; take off D. pick out ; drop out

14. - What do you think of the plan?

- It's easier said than _______.

A. carried out B. carrying out C. carry out D. to carry out

15. Scientists have discovered a close ________ between smoking and several serious disease.

A. action B. union C. connection D. combination

16. It was in 1458_________ Turks defeated the Greeks and ________ Athens .

A. that ; seized control of B. which ; experienced control over

C. that ; seized hold of D. / ; took control of

17. Today , we'll discuss a number of cases ________ beginners of English fail to use the language properly .

A. which B. as C. why D. where

18. It _______ to me that we might spend our holidays in another city .

A. took place B. happened C. occurred D. chanced

19. The students entered the classroom , smiling and ____,and _____ down to have their lessons.

A. talked ; sat B. talking ; sitting C. talking ; sat D. talked ; sitting

20. - Tom, you are caught late again .

- Oh, ________.

A. not at all B. just my luck C. never mind D. that's all right

21. - Did you find the missing couple in the mountain yesterday?

- No, but we ______ to get in touch with them ever since .

A. have tried B. have been trying C. had tried D. had been trying

22.The professor walked onto the platform and seated himself in a chair , ________ for answering questions.

A. had prepared B. being prepared C. preparing D. prepared

23.The picture of the park _______ memories of our class's trip last year, when Mr. Smith began to take charge of our class.

A. called up B. reminded C. turned up D. came up

24.Many people have been ill from a strange disease these days ,__ we've never heard of before.

A. one B. that C. it D. this

25. - What should we pay more attention to if we go north in winter, Mum?

- Nothing much . Take warm clothes _____ the weather is cold.