21. --- I’m sorry I didn’t go to your party last night.
--- ______, I know you’re busy these days.
A. Of course B. No kidding C. That’s all night D. Don’t mention it
22. He suddenly appeared on such ______ snowy night, which gave us ______ great surprise.
A. the; 不填 B. the; a C. a; a D. a; the
