It ’s our duty to_________people_________too many trees.
| A．stop; cutting down | B．prevent, to cut down |
| C．keep; cutting down | D．make; cut down |
—Simon，I wonder _______.—Last Saturday.
| A．when the foreign visitors arrived | B．when did the foreign visitors arrive |
| C．when the foreign visitors will arrive | D．when will the foreign visitors arrive |
The factory ______ its waste into the river, but now it deals with the waste in a new way.
| A．used to dump | B．is used to dump | C．used to dumping | D．is used to dumping |
一Shall we go out for a trip to relax ourselves after the final exam?
| A．That’s all right. | B．It doesn’t matter. |
| C．That’s a good idea. | D．Have a great time. |
—We need a new leader for our Helping Hands Club，but I don’t know_______.
—Why not Mary? She is always willing to help others.
| A．what to choose | B．how to choose | C．when to choose | D．who to choose |
To improve his English，he spends _______one hour a day listening to English programmes.
| A．at last | B．at least | C．at once | D．at all |