20．—Is that Dec. 21, 2012 is the end of the world true?
—Definitely not, but________must be paid to the global climate change.

－Did you receive any news during Jamie’s long _________?
－Never.

I was so familiar with him that I recognized his voice _____ I picked up the phone.

Whenever we’re in ________, we should never lose ______ but try to think of  the way out.

Father went to his doctor for ______  about his heart trouble .

24. ---Lily has won the math competition.
---No________she looks so happy.

22．—Shall we go out for__________walk?
—Sorry．This is not the right____________to invite me．I am too tired to walk．

Any help from you will be greatly appreciated. P1ease give me a reply at your earliest            .

24．—You shall get an iPhone as long as you come out first in the contest．
—Is that a ____? Don't let me down, I hope．

It is a beautiful car, but it is not ______ the price that I paid for it.