--- Mr. Green, I think physics is too difficult for me.
---Tom, work hard, _______ you’ll find it not as difficult.
| A．or | B．but | C．so | D．and |
It’s not polite to make fun of others.
| A．look at | B．laugh at | C．be strict about | D．look for |
Lucy is good at playing the piano.
| A．is good for | B．is bad for | C．does well in | D．does bad in |
May I have a rest? I have already finishedthe report.
| A．writing | B．write | C．to write | D．written |
It was stupid __him __this mistake .
| A．for;to make | B．of;to make | C．for; make | D．to;to make |
We must do everything we canwaste water from running into rivers.
| A．keep | B．kept | C．to keep | D．keeping |