I can't remember made the teacher give Mary the permission to leave the class earlier．
| A．that it was what | B．that was it what |
| C．what was it that | D．what it was that |
Take a hat with you in case the sun is very hot.
| A．in case | B．so that |
| C．in order that | D．when |
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 |