--- Could I smoke here?
--- .Look at the sign "No smoking."
| A．Yes, you may | B．Of course you can |
| C．No, you can't | D．No, you couldn't |
If I find his phone number，I ________ you．
| A．tell | B．told | C．will tell | D．have told |
People often go skating in ________ winter．
| A．/ | B．a | C．an | D．the |
．—Has your father finished his report?
—Sorry，I don’t know．He ________ it this morning．
| A．was writing | B．wrote | C．has written | D．had written |
—Could you please come to the museum with me this afternoon?
—Sorry，I ________．I have to take a piano lesson at 2 pm．
| A．couldn’t | B．mustn’t | C．can’t | D．needn’t |
—May I listen to the music here，Mr.White?
—Sorry，you’d better ________ it like that．
| A．not to do | B．not do | C．don’t do | D．not do to |