-- What’s your favorite sport?
-- Swimming. I think it´s _________.
A. easier
B. more difficult
C. the most interesting
—I saw Mr Smith in the office at ten yesterday morning．
—That’s impossible．He________an English party with us then．
| A．has |
| B．had |
| C．was having |
| D．has had |
________I was in the US，I made a lot of American friends．
| A．While |
| B．Although |
| C．Unless |
| D．Until |
—I don’t know________．
—Because he has to look after his mother．
| A．why he is leaving |
| B．why is he leaving |
| C．whether he is leaving |
| D．whether is he leaving |
She________to an English program while her parents________TV．
| A．was listening；is watching |
| B．listened；were watching |
| C．was listening；watched |
| D．was listening；were watching |
—I didn’t see you at the beginning of the party last night．
—I________on nay biology report at that time．
| A．worked |
| B．work |
| C．was working |
| D．am working |