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21.You are very _______ to take the trouble to help me. I can not thank you enough.A. whisper B.vital C.thoughtful D.considerable 22.Whats your favorite kind of music? Do you like _______ music. A. domestic B.classical C.existence D.feature 23.This nation is noted for its economic _______. A. uniform B.stability C.gulf D.democratic 24.He wants to _______ his appointment from Monday to Wednesday. A. transfer B.decay C.advance D.postpone 25.This is what I could do. There is no other _______ for me. A. sleeve B.residence C.burden D.alternative 26.Our teacher always sees the _______ side of everything. A. spot B.negative C.efficient D.robot 27.If you want to make a call, first, pick up the _______,then deposit a coin in the slot. A. receiver B.speaker C.microphone D.hook 28.The service in this restaurant is not good. Even the _______ is very dirty. A. milk B.salad C.soup D.menu 29.I am _______ enough to make up my own mind. You do not need to teach me. A. young B.mature C.numerical D.guarantee 30.Im _______ youve made the right choice. A. bond B.confident C.double D.gravity | 
