Fred entered without knocking and, very out of breath, sank _______ a chair.
| A．on | B．off | C．into | D．to |
Once harm is ______ to the eco-system, all species will ______ , including man himself .
| A．made; be in danger |
| B．done; be dangerous |
| C．caused; be endangered |
| D．done; be in danger |
With no more wood added to the fire, it finally died ______
| A．away |
| B．from |
| C．out |
| D．off |
-When did the Asian Games ______？
-I remember that people held the first Asian Games in 1951.
| A．come into power |
| B．come into being |
| C．come true |
| D．come out |
The river ______ badly now. We must do something to stop the waste water from being poured into it.
| A．is polluting |
| B．pollutes |
| C．is being polluted |
| D．has polluted |
In my opinion, ______ wild animals should be allowed to live in ______ wild.
| A．/; / |
| B．the; the |
| C．/; the |
| D．the; / |