12.　　 12.　　 The highest temperature ______ in any furnace on earth is about 10,000 centigrade.

a. we can get　　 b. that we can get it　　 c. which we can get it　　 d. what we can get

11.　　 11.　　 Geometry, ______ I know nothing, seems a very dull subject.

a. that　　 b. about that　　 c. which　　 d. about which

10.　　 10.　　 It is hard to avoid mistakes. ______ you correct them conscientiously, it will be all right.

a. In the case　　 b. As long as　　 c. Although　　 d. Despite

9.　 9.　 No sooner had he finished his speech ______ stormy applause broke out.

a. when　　 b. then　　 c. than　　 d. as

8.　 8.　 I don’t know why she’s looking at me ______ she knew me. I’ve never seen her before in my life.

a. as　　 b. although　　 c. even if　　 d. as if

7.　 7.　 It is fitted with a small transformer, by means of ______ the voltage of the currency can be adjusted.

a. whom　　 b. which　　 c. what　　 d. that

6.　 6.　 When he just got off the plane, he gave us a good description of ______ in Spain.

a. what he had seen　　 b. that he had seen　　 c. which he had seen　　 d. he had seen what

5.　 5.　 The professor spoke in a loud voice ______ every one of us could hear him.

a. such that　　 b. so　　 c. so that　　 d. such

4.　 4.　 We are worried about our son because no one is aware ______ he has gone.

a. the place　　 b. of where　　 c. about the place　　 d. where

3.　 3.　 Strange ______ his behavior may be, there is a very good reason for it.

a. although　　 b. even if　　 c. that　 d. as