16.A good storyteller must be able to hold his listeners’curiosity ________he reaches the end of the story.

A. when　　 B. unless

C. after　　 D. until

15.Don’t be afraid of asking for help ________ it is needed

A. unless 　　　B. since

C. although 　　　D. when

14.Mr. Hall understands that _______ math has always been easy for him, it is not easy for the students.

A. unless　　 B. since　　 C. although 　　　D. when

13.Sally worked late in the evening to finish her report ________ her boss could read it first next morning.

A. so that　　 B. because

C. before 　　　D. or else

12.It was an exciting moment for these football fans this year, _________ for the first time in years their team won the World Cup.

A. that 　　　B. while

C. which　　 D. when

11.-Was his father very strict with him when he was at school？

-Yes, he had never praised him _______ he became one of the top students in his grade.

A. after 　　　B. unless

C. until 　　　D. when

10.-It’s a long time _______ I drunk so much.　

-Yes, and what a pity it is since it will be a long time ______ we see each other again.

A before; since　　　　　　　　 B. when; when

C. since; before　　　　　　　　 D. when; then

9. - Mrs Green is angry with Mary. It seems ______ she is going to call her mother.　

- Right, let’s persuade Mary to give up now.

A as if　　　　　　　　　　　 B as long as

C even if　　　　　　　　　　 D in order that

8. He shut the window with such force _____ the glass broke.

A which　　　　　　 B that　　　 C as　　　　　 D if

7. John plays the piano _____, if not better than, David. But he never shows off in public.

A. as well　　　　 B. as well as　　　　 C. so well　　 D. so well as