6.  ─ Oh, it’s you, Jerry? I _______ you.

─ I’ve just changed my hair style, and I’m wearing a pair of sunglasses.

A. don’t recognize   B. haven’t known   

C. hadn’t know  D. didn’t recognize

7.  ─ What do you think I can do about it?

─ Don’t worry. The information ______ be true.

A. mustn’t    B. can’t     C. wouldn’t   D. might