-- you come to my birthday party tomorrow, Robert?
-- I'm afraid not. I have lots of homework to do.
A:Must
B:Should
C:Can
D:Need
A: Excuse me! ____
B: Yes. Please keep your desk clean.
A: ____
C: Wow! Your picture is so beautiful!
B: ____
C: Oh, I'm sorry. ____
B: Sure!
C: ____
B: Yes, work quietly.
A. Can I write my diary here?
B. May I use your pencil?
C. Anything else?
D. OK. I will.
E. Be quiet, please!
一 Have a good trip! 一 !