13. She made a note of it _____ she might forget.

A. so that                         B. in order that

C. if                                 D. in case

14. The fire went on for quite some time _____ it was brought under control.

A. when                           B. since

C. after                            D. before

15. They sat down opposite each other, but it was some moments _____ they spoke.

A. after                            B. before

C. since                           D. when

16. _____ the government agrees to give extra money , the theatre will have to close.

A. Until                            B. Unless

C. Since                           D. While

17. ______ I suggest, he always disagrees.

A. However                      B. Whatever

C. Whichever                    D. Whoever

18. Their country has plenty of oil, _____ ours has none.

A. while                            B. when

C. unless                           D. since

19. “______when do the pubs stay open?” “About midnight.”

A. Since                            B. Before

C. Until                             D. After

20. ______ I understand what you say, I can’t agree with you.

A. Since                            B. Because

C. If                                 D. While 

21. You should let your children play ______ you can see them.

A. where                           B. when

C. in which                        D. that

22. They kept trying _____ they must have known it was hopeless.

A. if                                  B. because

C. when                            D. where

23. _____ you are at home alone, please don’t leave the door open.

A. While                            B. As

C. Before                           D. How

【参考答案】

1—5 DDBDA  6—10 CBBCA  11—15 CBDDB 

16—20 BBACD 21—23 ACA (from www.hxen.com)