—Do you mind my taking this seat?
—_______________.
| A．Yes，sit down please | B．No，of course not |
| C．Yes，take it please | D．No，you can’t take it |
The government has to close those small factories to prevent the water of the river ______.
| A．polluting | B．from polluting | C．being polluted | D．polluted |
He wants to see changes in the company and I am sure he will，______.
| A．on time | B．in time | C．at one time | D．at a time |
The traditional view is ____ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |
Then you usually lie there just ______ the ceiling, thinking about everything that could go wrong.
| A．glancing at | B．watching at | C．glaring at | D．staring at |
—What do you think of his opinion?
—None has given me ___________ piece of advice.
| A．a better | B．a best | C．the best | D．the better |