What he has done has a bad effect ________ the children.
| A．in | B．on | C．by | D．through |
I like getting up very early in summer.The morning air is so good ________.
| A．to be breathed | B．to breathe |
| C．breathing | D．being breathed |
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 |