Substances will expand or contract ______ heated or cooled, but this is not the case with water.
| A．when they will be | B．if they will be |
| C．as they being | D．when |
Fred entered without knocking and, very out of breath, sank _______ a chair.
| A．on | B．off | C．into | D．to |
-----Did you watch the basketball match yesterday?
-----Yes, I did. You know, my brother ________ in the match.
| A．is playing | B．was playing | C．has played | D．had played |
The two girls are getting on very well and share _______ with each other.
A. little B. much C. some D none
__________of the land in that district __________ covered with trees and grass．
| A．Two fifth; is | B．Two fifths; is | C．Two fifth; are | D．Two fifths; are |
You __________ put your computer in your bedroom．
| A．don’t need | B．had not better | C．had better not | D．ought not |