Remember that ______ is better than cure, so brush your teeth at least twice a day and visit your dentist for regular check-ups.
| A．priority | B．privilege |
| C．principle | D．prevention |
The book about environment ______ the importance of protecting the earth.
| A．starts | B．states | C．tells | D．says |
It was ______ back home after the experiment.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
________ with the size of the whole earth, the biggest ocean does not seem big at all.
| A．To compare | B．When comparing | C．Comparing | D．When compared |
I would appreciate ______ if you could write to me as soon as possible.
| A．that | B．this | C．it | D．one |
They often quarrel with each other about small things, which they couldn’t ________ finally.
| A．put up with | B．put up | C．catch up with | D．come up with |