—I hear Robert has gone to Harvard University for his masters degree.
—Oh,how nice!Do you know when he ?
| A．was leaving | B．left |
| C．had left | D．has left |
The picture ______ on the wall is painted by my grandfather.
| A．having | B．hanging | C．hangs | D．being hung |
Smoking pollutes air. You ______ smoke here.
| A．won’t | B．can’t | C．ought not to | D．needn’t |
Jane was dressed in red ______ Joe was dressed in blue.
| A．however | B．when | C．while | D．as |
---- Did you watch the football match yesterday?
---- Yes, I did. You know, my brother ______ in the match at that time.
| A．is playing | B．was playing |
| C．has played | D．had played |
---- Ann is in hospital.
---- Oh, really? I ______ know. I ______ go and visit her.
| A．didn’t; am going to | B．don’t; would |
| C．don’t; will | D．didn’t; will |