二：语法和词汇知识（共20小题，每小题1分，满分20分）。
6._________we must keep in mind is that we must protect water and use it wisely.
| A．Why | B．What | C．Where | D．How |
It to look after these naughty grandchildren of mine for a whole day.
| A．put me down | B．drove me out | C．wore me out | D．pulled me through |
. We can’t wait. We have to the direction and the distance before we take action.
| A．make out | B．figure out | C．think out | D．turn out |
We want our children to know that hard work .
| A．comes off | B．gives off | C．pays off | D．sees off |
. Teaching a pronunciation class to a mixed group of learners can a teacher with many challenging problems.
| A．provide | B．produce | C．present | D．offer |
If you do not feel well, you should not ____going to see the doctor. ?
| A．pick out | B．give off | C．put off | D．make out |