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。
21.—I’m afraid I couldn’t go to your birthday party. I have a test next Monday.
—Oh， ！You’re my best friend and you must be there！
A. go ahead B. come on C. you needn’t D. it doesn’t matter
22. I didn’t make sense of ____ poem until I read it ____ third time.
A. the; the B. a; the C. the; a D. a, a
23. No driving after drinking is a rule that every driver _______ obey in our country.
A. will B. shall C. may D. can
