The scientist decided to devote his life to ____ pollution from ____ again.
| A．preventing; happening | B．prevent; happen |
| C．preventing; happens | D．preventing; will happen |
After three hours’ climbing , they reached they thought was the place they’d been dreaming of .
| A．what | B．which | C．where | D．that |
I showed an old friend of mine around the city,surprise, the changes had been so great.
| A．whose | B．which | C．to whose | D．to which |
Unfortunately, when I arrived she ________, so we had only time for a few words.
| A．just left | B．had just left |
| C．has just left | D．was just leaving |
— Has Tim started? He said he would join in the party.
— He ____．He is a man of keeping his word.
| A．could have left | B．must have left | C．can’t come | D．won’t be coming |
Drivers who listen to music on road are more likely to have accidents, a science magazine said recently.
| A．the ; 不填 | B．a ; the | C．不填; 不填 | D．不填;the |