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 wasnt 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
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