I don’t know the teacher ________ is talking with Miss Wang．
| A．what | B．whom | C．which | D．who |
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 |