The river has become much ______ than before because of the waste water.
A. dirty B. dirtier C. Dirtiest
The man is confident of himself when he is________the face of difficulties．
| A．for |
| B．in |
| C．with |
| D．on |
I can see some children________basketball in the playground now．
| A．play |
| B．played |
| C．playing |
| D．to play |
The boy was badly ill．He had to drop out of school because of________．
| A．darkness |
| B．illness |
| C．history |
| D．excitement |
We shouldn’t________he trees in order to protect the environment．
| A．write down |
| B．put down |
| C．take down |
| D．cut down |
The young man is________more famous than his father．
| A．a lot |
| B．many |
| C．pretty |
| D．quite |