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ords in it.A. and B. if C. though D. because 37. ___ he is very young, ___ he knows a lot about science.A. Because。 so B. Though。 / C. When。 and D. Though。 but38. I was walking along the street ____ I heard a cry from behind. A. when B. before C. while D. if39. A woman saw it happen ____ she was walking past. She picked it up___ gave it back to me.A. before。 but B. after。 so C. because。 or D. when。 and 40. It39。s a long time ___ we met last time.A. for B. before C. till D. since 41. We didn39。t find water and grass ___ we had passed several villages.A. because B. when C. until D. after 42. he finished the work, he left the office.A. Before B. Until C. As well as D. After 43. Mother didn39。t go to bed ____ she finished making the birthday cake for Ann.A. until B. since C. because D. after44. I haven39。t heard from him___ we left school.A. after B. before C. when D. since二、用適當?shù)倪B詞將兩句簡單句合并成一個復合句:1. Mr Green talked to Alice. Alice worked harder.2. She was late for school. She missed the 6:30 bus.3. The Englishman was trying hard. The American gave up.4. The students still had their sports meeting. It was raining.5. You are able to book three tickets. I shall go to the show with you.6. They have known each other. They began to work in that factory.7. I saw your uncle. I was walking in the street.8. She tried to work out the problem by herself. She asked for help.9. I will believe it. I hear it with my own ears.10. The guard will let you go in. You show him your pass.三、用所給的連詞填空:when, because, before, if, after, as so... that, since, as... as, not. . . until1. Please e to my home ____ you are free tomorrow.2. I got to know her brother ____ I was a boy.3. ___ the boy watched TV, he went to bed.4. Yesterday Tom didn39。t go to see the film ____ he went over his lessons.5. It39。s ___ hot ___ I can39。t go to sle