从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
2l.—May I serve your dishes,sir?
— .
A.No,go ahead B.Yes,please C.Hurry up D.Yes,help yourself
22.Because of high demand for Type AB blood, supplies of it are usually limited.
A.the;the B.不填;不填 C.不填;the D.a;the
23.How much you earn is not very important.It is how you earn the money that .
