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12. _____ we got to the station, the train had left already.

A. If　　　　　　 　　　 B. Unless　　　　　　　 C. Since　　　　　　　　 D. When

11. I learned a little Russian _____ I was at middle school.

A. though　　　　 B. although　　　　　 C. as if　　　　　　　　　 D. when

10. Busy _____ he was, he tried his best to help you.

A. as　　　　　 　 B. when　　　　　　　　 C. since　　　　　　　　 D. for

9. _____ she was very tired, she went on working.

A. As　　　　　 B. Although　　　　　 C. Even　　　　　　　　 D. In spite of

8. _____ still half drunk, he made his way home.

A. When　　　　 B. Because　　　　　　 C. Though　　　　　　 D. As

7. They will never succeed, _____ hard they try.

A. because　　　 B. however　　　　　　 C. when　　　　　　　　 D. since

6. It is about ten years _____ I met you last.

A. since　　　　 B. for　　　　　　　　　　 C. when　　　 　　 D. as

5._____ you go, don't forget your people.

A. Whenever　　 B. However　　　　　 C. Wherever　 　　 D. Whichever

4. Read it aloud _____ the class can hear you.

A. so that 　　　　　　 B. if　　　　　　　　　　　 C. when　　　 　　 D. although

3. We will work ____ we are needed.

　　　 A. whenever　　　　　 B. because　　　　　　 C. since　　　　　 　　　 D. wherever