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2. She will sing a song ____ she is asked.

    A. if               B. unless        C. for           D. since

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1. I’ll let you know ____ he comes back.

    A. before        B. because       C. as soon as      D. although

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18. Hard _________ he tried, he couldn’t force the door open.

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17. The boy was so tired __________ he fell asleep on the bus.

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16. __________ you lock all the doors, he can still manage to get in.

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15. He was angrier __________ ever before.

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14. The meeting became so disorderly __________ the speaker had to shout the audience down.

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13. We're doing everything we can to make things as easy for you ___________we can.

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12. She wouldn't forget her mother's birthday __________ she seldom wrote to her family.

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11. We would try to get a car __________we could all travel together more easily.

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