The teacher asked me____________.
| A．when did I finish my work | B．when I finished my work |
| C．when I finish my work | D．when do I finish my work |
－How about having a picnic with me?
－I’d love to, ______ I’m afraid I have no time.
A. so B. and C. but
－Dad, may I watch TV?
－No, you can’t. You _______ finish your homework first.
A. must B. can C. may
－Oh, so many people in the park?
－Nobody likes to stay at home ______ Sunday morning.
A. in B. on C. at
－How much is the pair of shoes?
－Twenty dollars ____ enough.
A. is B. are C. am
－Do you mind my opening the window?
－______. Please do it now.
A. Of course not. B. Yes, I do. C. Certainly