40. Prices of daily goods ____ through a computer can be lower than store prices.

　 A. are bought　 B. bought　 C. been bought　　 D. buying

39. When ______, the museum will be open to the public next year.

　 A. completed　　　　　 B. completing

　 C. being completed　　　 D. to be completed

38. ______ in 1636, Harvard is one of the most famous universities in the United States.

　 A. Being founded B. It was founded

　 C. Founded D. Founding

37. The research is so designed that once ___ nothing can be done to change it.

　 A. begins　 B. having begun　　 C. beginning　 D. begun

36. ______ such heavy pollution already, it may now be too late to late to clean up the river.

　 A. Having suffered　 B. Suffering　 C. To suffer　 D. Suffered

35. _____ the general state of his health, it may take him a while to recover from the operation.

　 A. Given　　 B. To give　　　 C. Giving　 D. Having given

34. _____ in thought, he almost ran into the car in front of him.

　 A. Losing　 B. Having lost　 C. Lost　　 D. To lose

33. Friendship is like money; easier made than _____.

　 A. kept　　 B. to be kept　　 C. keeping　 D. being kept

32. The computer center, _____ last year, is very popular among the students in this school.

　 A. open　　 B. opening　　 C. having opened　 D. opened

31. ______ more attention, the tree could have grown better.

　 A. Given　　 B. To give　　 C. Giving　　 D. Having given