28. His technique has developed to the point ______ he can repair many of the electrically powered machines.

A. what 　　　　　 　　　 　B. which 　　　　　　　　 　C. where 　　 　　　　　　　 D. when

27. She is no longer the childish girl ______ she was.

A. whom 　　　　　　　 　B. who 　　　　　　　　　　 　C. which 　　　　　　　　　 D. that

26. John seems a nice person. ______ I don’t trust him.

A. Even so 　　　　　　 　B. Even though 　　　　 　C. Therefore 　　　 　　　 D. Though

25. He’s bought a cottage in the country for ______ he retires, with the money he’s saved over half of his life.

A. when　　 　　　　　　　 　 B. where　　 　　　　　　　 C. what 　　　　　　　　　　 D. which

24. Mrs. Smith locked both the front and the back doors before she went to bed ______ a thief might steal into the house.

A. so 　　　　　　　　　　 　 B. for fear that　 　　 　C. unless　　　 　　　　　　　 D. in case

23. ______ is no possibility ______ Bob can win the first prize in the match.

A. There; that　 　　 　B. It; that　 　　　　　　 　C. There; whether　 　　 D. It; whether

22. It wasn’t such an expensive gift______ he had promised her.

A. that　　　　　 　 　B. what　　　　 　　　 　C. as　　　　　　 　　 D. which

21. --- _______ was it _______ they discovered the entrance to the underground palace?

--- Totally by chance.

A. What; that　　 　　　 　 B. How; that　　　 　　　 C. When; how　　　 　　　 D. Where; how

20. 　　_ 　you call me to say you're not going to the play, I'll see you at the theatre.

A. Once　　　　　　 B. As long as　　 　 　C. Unless　　 　　　 D. As soon as

19. ______ you may be right, I can’t altogether agree.

A. As 　　　 　　　　　　　 　　B. While 　　　　　　　 　C. If 　 　　　　　　　　　　 D.Since