As a environmentalist, he hopes to devoted his life water and air pollution a peaceful life.
| A．prevent; living |
| B．preventing; living |
| C．prevent; to live |
| D．preventing; to live |
. If the weather had been better , we could have had a picnic .But it ___all day.
| A．rained | B．rains | C．has rained | D．is raining |
She stared at the painting,wonder where she ____it.
| A．saw | B．has seen | C．sees | D．had seen |
John was given the same suitcase his father and grandfather _______with them to school.
| A．took | B．had taken | C．were taking | D．would take |
When I talked with my grandma on the phone ,she sounded weak , but by the time we ____up ,her voice had been full of life.
| A．were hanging | B．had hung | C．hung | D．would hang |
—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 |