21. Teaching a pronunciation class to a mixed group of learners can __ a teacher with many challenging problems.

　　A. provide B. produce C. present D. offer

　　22. We want our children to know that hard work_____.

　　A. comes off B. gives off C. pays off D. sees off

　　23. We can’t wait. We have to ____the direction and the distance before we take action.

　　A. make out B. figure out C. think out D. turn out

　　24. It____to look after these naughty grandchildren of mine for a whole day.

　　A. put me down B. drives me out C. wears me out D. pulls me through

　　25. We’d better try to ____with the experiment, I think. Now let’s ___ with it.

　　A. go through; go on B. go on; go over

　　C. go over ; go through D. go on; go through

　　26. The host stood at the door and ______ every guest a welcome.

　　A. nodded B. dropped off C. shook D. moved

　　27. No one knows when XO was first discovered, or how it ___to be such a popular drink.

　　A. went B. came C. got D. became

　　28. The Party Central Committee ____the Chinese people to work hard for the economic development.

　　A. calls on B. calls up C. calls out D. calls for

　　29. We always ____we have said.

　　A. lead to what B. see to what C. get to what D. hold to what

　　30. Don’t forget to ____your things after you have finished your homework .

　　A. set aside B. put away C. take away D. put into

　　31. The actor was so interesting that he___us laughing all the time when we were chatting.

　　A. made B. keep C. had D. let

　　32. I can’t find my watch. I must have ____it in the hotel.

　　A. lost B. missed C. left D. forgot

　　33. All of us still remember the terrible earthquake that____Tangshan twenty years ago.

　　A. attacked B. struck C. knocked D. exploded

　　34. Being much too fat, the lady was advised to reduce her food for each meal, yet she would ________ that.

　　A. have none of B. accept C. take care of D. listen to

　　35. As director of the company, I can’ t ___three weeks away from work.

　　A. carry B. cost C. afford D. pay

　　36. When I entered his room, I found him ____an armchair, deep in thought.

　　A. sitting on B. sit in C. seated on D. seated in

　　37. The good service at the hotel ___the poor food to some degree.

　　A. made up for B. saved up for C. took the place of D. turn out

　　38. His strength had almost __when they found him in the desert.

　　A. given out B. given in C. given up D. given off

　　39. — Your tie looks smart. It ___with your shirt perfectly.

　　— Thanks. I’m glad you like it.

　　A. matches B. meets C. agrees D. goes

　　40. Anything that is dropped__towards the centre of the earth.

　　A. fall B. falls C. has fallen D. is falling