单项选择从A.B.C.D四个选项中，选出可以填入空白处的最佳选项。

21.-Which one of these do you want?-_______Either will do.

A.I don't mind B.I'm sureC.No problem D.Go ahead

22.Sarah looked at _______ finished painting with _______ satisfaction.

A.不填;a B.a;the C.the;不填D.the;a

23."Life is like walking in the snow",Granny used to say,"because every step__________."

A.has shown B.is showing C.shows D.showed

24.It is by no means clear _______ the president can do to end the strike.

A.how B.which G that D.what

25.I don't believe we've met before,_______ I must say you do look familiar.

A.therefore B.although C.since D.unless

26.The result is not very important to us,but if we do win,then so much _______.

A.the best B.best C.better D.the better

27.Mary is really good at taking notes in class.She can _______ almost every word her teacher says.

A.put out B.put down C.put away D.put together