____________ no doubt that 100 years ago animal testing was cruel but today animals in experiments are very well taken care of.
| A．It is | B．There is | C．This is | D．That is |
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 |
I was out of town at that time, so I don’t know exactly how it ______.
| A．was happening | B．happened |
| C．has happened | D．happens |