—Why does the lake smell terrible?
—Because large quantities of water _____.
| A．have polluted. | B．is being polluted. |
| C．has been polluted. | D．have been polluted. |
—— “ Is your uncle a driver?”
—— “_____.”
| A．No, but my aunt is | B．Yes, but my anut is |
| C．No, he doesn’t | D．Yes, he does |
They_____happy when they hear the news.
| A．will | B．will be | C．were | D．don’t |
careful when you cross the street.
| A．Don’t be | B．Do be | C．Being | D．Do |
terrible weather we’ve been having these days!
| A．How a | B．What a | C．How | D．What |
Oh, John, you gave us!
| A．How a pleasant surprise | B．How pleasant surprise |
| C．What a pleasant surprise | D．What pleasant surprise |