21. It was not until ________ couple arrived at the cinema that they found they had left ________ tickets in the office.
A. a; 不填 B. the; the C. a; the D. the; 不填
22. --Excuse me, is this shop open all day?
--________. It’s only open from 9 a.m. to midnight.
A. Well, I’m not sure B. Oh, it’s nothing special
C. Sorry, I’m afraid not D. Yes, of course not
