—Why does the River smell terrible?
—Because large quantities of water .
| A．have polluted | B．have been polluted |
| C．has been polluted | D．is being polluted |
— I'll come to listen to your speech at 9:30 tomorrow morning.
— I regret to tell you that by then my speech ____.
| A．had ended | B．has ended | C．will have ended | D．will end |
_____ is the population of China? It is about 1,300,000,000.
| A．How many | B．How much | C．What | D．How |
Some doctors suggest that vinegar will ____ people from being infected ___ H1N1.
| A．protect; to | B．prevents; from | C．prevent; with | D．protect; in |
Our school is no longer ____ it was 10 years ago, _____ it was not well equipped.
| A．what, which | B．that , which | C．what, when | D．that, where |
He has been acting strangely these days. I can’t _____ his actions at all.
| A．account for | B．ask for | C．call for | D．stand for |