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
______ 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