29. He was wandering through the street, looking around _____ he walked.

A. as　　　　　　　 B. since　　　　 C. while　　　 D. when

28. He is running _____ the wind towards the east of the station ____ Tom running

　　　 the right.

　　　 A. down; and; on　　 B. against; with; on C. for; with; in D. with; while; to

27. He said to me, "You should do the right thing__ the right time."

　　　 A. at　　　　　　　 B. in　　　　　 C. by　　　　　 D. for

26. Please meet me ______ the square _____ sunset.

　 　　A. on; at　　　　　 B. in; at　　　 C. on; when　　 D. in; when

25. They were told to ____ on the bottle ______ taking the medicine.

　　　 A. follow the instructions; for　　 B. follow the instruction; for

　　　 C. follow the instructions; on　　　 D. follow the instruction; on

24. A　 Professor Smith was asked to give us ______ how to learn English.

　　　 A. some advice on　 B. advices on　 C. advice about　 D. advices about

23. We plant trees _____ and many of the trees are growing tall _____.

　　　 A. year after year; year after year B. year by year; year by year

　　　 C. year after year; year by year　　 D. year by year; year after year

22. The fact that Cook's journey by ship was quite _______ surprised most travelers with many years' _______.

　　 　A. experience; experiences　　　　 B. an experience; experience

　　　 C. a few experiences; experience　 D. experiences; experiences

21. It's October. It's time for farmers to ______ their crops.

　　　 Which of the following is WRONG?

　　　 A. get in　　　　 B. harvest　　　　 C. gather　　　　　 D. collect

20. He made another wonderful discovery, ____ of great importance to science.

　　　 A. which I think is　　　　　　　　 B. which I think it is

　　　 C. which I think it　　　　　　　　 D. I think which is