29. The students in the university are all taking courses 　　　a degree.　

　 A. coming to　　 B. going to　 　 C. leading to　　 　　　 D. turning to

28. 　　different kinds of pianos, the workers farther improved their quality　

　 A. To produce　 　 B. Being produced 　 C. Produced 　 　 D. Having produced

27. A person 　　a foreign language must be able to use the foreign language 　　　all about his own.　

　 A. to learn, to forget B. learning, to forget　C. to learn, forgetting　 　　　 D. learning, forgetting

26. The wallet 　　several days ago was found 　　in the dustbin outside the building.　

　 A. stolen, hidden　　　　 B. stealing, hiding　　 C. stealing, hidden　 D. stolen, hiding

25. Lessons 　　　　　easily were soon forgotten.　

　 A. to learn　　　　 B. learn　 　　　　 C. learned　　　 　　　 D. learning

24. The ground is 　　　　with 　　　　　leaves.　

　 A. covering, falling 　　　 B. covered, falling　　 C. covered, fallen 　 　　 D. covering, fallen

23. The library's study room is full of students 　　　　　for the exam.

　 A. busily prepared　 B. busy preparing　　　　 C. busily prepare 　 　 D. are busily preparing

22. The scientists were waiting to see the problem 　　　　.　

　 A. settle　　 　　 B. settled　　 C. to settle　　 　　　 D. settling

21. The foreigner tried his best, but he still couldn't make his point 　　.

　 A. understand　 　　　 B. understanding 　　 C. to understand 　 　 D. understood

20. People 　　　　in the city do not know the pleasure of country life.

　 A. live　　 　　　 B. to live　　 　 C. lived　　 　 D. living