The forests are getting fewer and fewer. We must _________ down too many trees.
| A．keep people from cutting | B．prevent people from cutting |
| C．stop people cutting | D．all the above |
We can make a fire ________the room warm so that we can chat for a while.
| A．to keep | B．keeping | C．keep | D．kept |
The girl ________ by the lake yesterday.
| A．saw to draw | B．was seen draw |
| C．was seen to draw | D．is seen to draw |
We are made ________ more confident by our teacher.
| A．to be | B．being | C．be | D．been |
The work ________ in two hours. Let’s hurry.
| A．must be finish | B．must finish |
| C．will finish | D．must be finished |
Andy loves playing the piano. He ________ the piano after school very often.
| A．is heard play | B．is heard to play |
| C．hears playing | D．hears play |