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