It’s not good idea to drive for four hours without break.
| A．a; a | B．the; a | C．the; the | D．a; the |
_______ 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 |
Mr Zhang is mild in character. He never shouts ____ he is very angry.
| A．if | B．even |
| C．though | D．even when |