---Excuse me, could I take this seat?

---Sorry, __________.

A. here you are   B. take it           C. it’s taken           D. never mind

—Excuse me, may I sit here?

—_____. The girl on the seat will return soon.

A. Yes, please         B. I'm afraid not        C. No, thanks

--Excuse me, can I smoke here?

--No, ______.

A. you must　　　　 B. you’d not better

C. you can　　　　　 D. you’d better not

— Can you come and play football with me?

?? —______. I have a lot of homework to do.

A. Excuse me ????????????? B. I’d like to? ????????????? C. I’m afraid not ????????????? D. It’s a pleasure

 -- Excuse me. May I use your eraser, please?

   -- Sure. ______

      A. Watch out!     B. Well done!         C. Go ahead.          D. Follow me.