The conference has been held to discuss the effects of tourism _______ the wildlife in the area.
| A．on | B．in | C．at | D．of |
The boy wanted to ride his bike in the street, but his mother told him _____.
| A．not to | B．not to do | C．not do it | D．do not to |
He kept the light in his room ______ the whole night.
| A．burnt | B．burning | C．burn | D．to burn |
----- We haven’t heard from Jane for a long time.
----- What do you suppose ______ to her?
| A．was happening | B．to happen |
| C．has happened | D．having happened |
In the USA, he made a lot of friends ______ English well to make himself ______.
| A．learn; understand | B．to learn; understood |
| C．learning; understand | D．learned; understood |
Please tell me the way you thought of ______ the garden.
| A．take care of | B．to take care of |
| C．taking care of | D．how to take care of |