3. __________ I know, he is likely to be a successful writer.

　A. So far as　　 B. As long as　　 C. Since that　　　 D. Even though

2. His speech was interesting and _______ to understand ________ a little too many idioms were used.

　A. difficult; though　　 B. hard; because　　 C. easy; if　　 D. easy; even though

1. Some of the students demanded that the plan __________ once more.

　A. should discuss　　 B. discussed　 　C. would be discussed　　 D. be discussed

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SB 2B Units 19-20

12. ______________ all speak at once! One_______________.

　A. Not; at one time　　　　　 B. Don’t; at one time

　C. Not; in no time　　　　　 D. Don’t; at a time

Keys to : SB 2B Units 16-18

11. It is said that Sue and Rose were close friends ____________.

　A. at a time　　 B. at one time　　 C. in no time　　 D. for time

10. Once________, it can never __________.

　A. see; forgotten　 B. seen; forget　　 C. seen; be forgotten　　 D. seeing; forget

9. The difficulty is _______coral needs certain _________ in order to live.

　A. 不填; state　　 B. that; conditions　 C. 不填; condition　 D. that; state

8. The boy couldn’t work out that difficult maths problem __________.　

　A. on one’s own　　 B. on the own　　 C. on his own　　 D. on its own

7. There are 5,000 visitors a day ______ and going ________.

　A. coming; on average　 B. come; in all　　 C. coming; for all　　 D. to come; at all time