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. —Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
A. must; must B. can; may C. must; can D. may; must
22. Don’t try to cheat the taxman(税务人员); you’ll never ______it.
A. get out of B. get into C. get along D. get away with
23. It’s accepted that men like playing football more than women.
A. especially B. generally C. simply D. totally
24. China is a country, but America is a country.
A. developing; developing B. developed; developed
C. developing; developed D. developed; developing
25．__________ has been announced, we shall have our final exam next month.
A. As B. It C. That D. What
26．Perhaps it is true that nobody in the world knows exactly how the earth __________.
A. came up B. came out C. came to power D. came into being
27．He always tells ____ lies, to tell you ____ truth, I don’t believe what he said at all.
A. /; / B. the; the C. /; the D. the; /
28．The lazy waiter ______ to his boss that he had ______ the table.
A. lay; laid B. lied; laid C. lied; lay D. laid; laid
