—Is Mike a diligent student?
—No，but he is a lazy one，if ．
| A．anything | B．something | C．everything | D．nothing |
I’ll keep his address _____ I need it.
| A．so that | B．in order that |
| C．in case | D．when |
_______ your composition carefully, some spelling mistakes can be avoided.
| A．Having checked | B．Check |
| C．If you check | D．To check |
________ more careful, the work might have been done better.
| A．Being | B．Having been |
| C．If you had been | D．To have been |
_______ your diet, it is easy to reduce.
| A．Watching | B．To be watching |
| C．If you watch | D．To have watched |
“How long do you suppose it is _______ he left for Japan?” “No more than half a month.”
| A．when | B．before |
| C．after | D．since |