二、单项填空（每小题1分，满分15分）
21. — He seems to be lost in thought. Why?
— Because the film _____his memories of his childhood.
A. calls up B. picks up C. brings up D. takes up
22. — I’m terribly sorry to have put you through so much trouble.
— _____. I know you didn’t mean to.
A. Forget about it B. No trouble C. All right D. You’re welcome
