To prevent the river from __________ again, the government ordered that the factory stop running.
| A．polluting | B．polluted |
| C．having polluted | D．being polluted |
I would ask George to lend us the money if I him.
| A．had known |
| B．knew |
| C．have known |
| D．know |
_ your help, we’d never have been able to get out of trouble.
| A．Had it not been |
| B．If it was not |
| C．If we had not been |
| D．If there has not been |
You will succeed in the end you give up halfway.
| A．even if |
| B．as though |
| C．as long as |
| D．unless |
To improve your oral English, everyone in the class is supposed to ____actively in these discussions.
| A．participate |
| B．attend |
| C．enter |
| D．take |
we move the vase to the windowsill? Do you think it’ll look better?
| A．What if |
| B．Only if |
| C．If only |
| D．Even if |