—Tom, you didn’t come to the party last night?
—I __________, but I suddenly remembered I had homework to do.
| A．had to | B．didn’t |
| C．was going to | D．wouldn’t |
Professor Williams keeps telling his students that the future ________to the well－educated.
| A．belongs | B．is belonged |
| C．is belonging | D．will be belonged |
The water ________ cool when I jumped into the pool for morning exercise.
| A．was felt | B．is felt | C．felt | D．feels |
—What's that noise?
—Oh，I forgot to tell you.The new machine ________.
| A．was tested | B．will be tested |
| C．is being tested | D．has been tested |
—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 |
His sister left home in 1998，and ________ since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |