I was doing my homework _______ mother was cooking.
| A．when | B．while | C．as | D．what time |
I haven’t decided when __________ a holiday yet.
| A．took | B．taking |
| C．to take | D．take |
Many young people took part in _______ trees on Tree Planting Day.
| A．planting | B．plants |
| C．to plant | D．plant |
Finish your homework first, then you’ll _____watch TV for an hour.
| A．can | B．be able to |
| C．able to | D．could |
—What’s wrong with you ? —________.
| A．My bike is broken |
| B．Something is wrong with my watch |
| C．My TV doesn’t work |
| D．I’m not feeling well. |
They arrived while we__________ dinner.
| A．Have | B．are having |
| C．were having | D．had |