---Must we leave the classroom now?
---No, you _____. You _____ leave after the bell rings.
| A．mustn't; are allowed to | B．don't have to; might |
| C．needn't; can | D．can't; are supposed to |
The girl was flying a kite________her father came back．
| A．when |
| B．while |
| C．until |
| D．after |
—I went to see you yesterday evening．But you weren’t in．Where were you then?
—I’m sorry．I________a walk by the lake with my classmates．
| A．am taking |
| B．was taking |
| C．take |
| D．took |
While we________about Mr.Wang in the classroom，he came in．
| A．talked |
| B．are talking |
| C．were talking |
| D．talk |
I was doing my homework________my father was reading newspapers．
A．how
B．while
C．if
—I was at the cinema at 9 o’clock last night．What about you?
—I________at home．
| A．am watching TV |
| B．was watching TV |
| C．will watch TV |
| D．watched TV |