I was doing my homework _______ my mother was doing some sewing.
| A．during | B．when |
| C．while | D．after |
—Sandy，can you tell me ________?
—Sorry，I’ve no idea．
| A．how many guests have been here | B．when is the party |
| C．why did they come | D．where will they leave |
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 |