31. ______ is natural, he married Mary.

　　A. It B. What C. Which D. As

　　32. The buses, ______ were already full, were surrounded by an angry crowd.

　　A. most of them B. most of which C. which most D. that most

　　33. All ______ is needed is a supply of oil.

　　A. the thing B. that C. what D. which

　　34. He paid the boy 10 dollars for washing ten windows, most of ______ had not been cleaned for years.

　　A. these B. those C. that D. which

　　35. She heard a terrible noise, ______ brought her heart into her mouth.

　　A. it B. which C. this D. that

　　36. In the dark street, there wasn’t a single person ______ she could turn for help.

　　A. that B. who C. from whom D. to whom

　　37. This is one of the means ______ the electric energy is conducted from one place to another.

　　A. by which B. by that C. through which D. through that

　　38. The place ______ you are going to visit is the ruin of a place.

　　A. in which B. at which C. where D. which

　　39. The last river ______ they crossed is two miles wide.

　　A. where B. which C. that D. in which

　　40. The Summer Palace is one of the most beautiful parks ______ built in the Qing Dynasty.

　　A. where were B. where was C. that were D. which was

　　答案： 31-35 DBBDB 36-40 DADCC

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