-- What can trees do _________ us ?
--- They can _________ harmful gases and produce oxygen .
| A．helping , take in | B．to help , take in | C．helping , take out | D．to help , take care |
The task in an hour. Then we can go home and have a good rest.
| A．was finished | B．will be finished | C．has been finished | D．can't be finished |
—Mark, where do you work? —I work in a company sells cars.
| A．when | B．where | C．who | D．which |
—What’s your plan for the summer holidays?
—I’ll go to Beijing the school terms ends.
| A．in order that | B．so that | C．as soon as | D．even though |
your help, I passed the English exam this time.
| A．Thanks to | B．Thanks | C．Thanks for | D．Thank |
—Smoking is bad for your health. —You’re right. I decide to .
| A．give it out | B．give it away | C．turn it off | D．give it up |