16. --- This is the refrigerator ______ we had so much trouble.

　　--- Get someone to repair it.

　　A. at which B. of which C. with which D. to which

　　17. Living in the central Australian desert has its problems, _____ getting water is not the least.

　　A. for which B. to which C. of which D. in which

　　18. She’s a teacher, _______ is clear from her manner.

　　A. that B. what C. as D. who

　　19. Mr. Green drove slowly on the way home until he reached the high way, _______ the speed limit was 60 miles per hour.

　　A. where B. which C. where D. that

　　20. Beijing government puts more than 700 million yuan to increase its green space this year, ______ doubles the money provided last year.

　　A. as B. while C. that D. which

　　21. “Who Moved My Cheese?”, _________ is a best-selling book, is written by Spencer Johnson.

　　A. which B. that C. it D. what

　　22. The wrong you have done him is terrible, for _____ you should make an apology to him, I think.

　　A. this B. which C. what D. that

　　23. Helen is much more kind to her youngest child than to the others, _____, of course, makes the others unhappy.

　　A. who B. which C. she D. that

　　24. The hours _____ the children spend in their one-way relationship with television people undoubtedly affect their relationship with real-life people.

　　A. that B. when C. in which D. on which

　　25. Edison made a lot of inventions, ______ of great importance.

　　A. which I think are B. which I think they are

　　C. which I think they D. I think which are