—Oil is everywhere in this store, so you know smoking is forbidden here.—I’m sorry.A. can B. may C. must
---It will be my turn. I feel a bit nervous. ---________. You can make it.
Please don't stand up in class until you ________.
You don't know __________________________.
---She’s never been to Shanghai, ____________? . --- ___________. But how she wishes to go there again.
John doesn’t play the piano _________________ his classmates in his class.