難度：★    考點(diǎn)：連詞

　　1. -Jim, you look so tired!

　　-Oh, I didn't go to bed ______ it was 12 o'clock last night.

　　A. until   B. as    C. if

　　2. -Bill, please turn down the music, ____Mon ____Dad are sleeping.

　　-Sony, 1'11 do it right away.

　　A. neither; nor        B. either; or        C. both; and

　　3. Please ell me the truth, ________ I can't decide how to help you next step.

　　A. so   B. or  C. but   D. for

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