While crossing the street, please ________ for the coming cars.
| A．watch out | B．take care | C．watch over | D．be careful |
They arrived at the farmhouse, in front of which________.
A is sitting a boy
B. sat a boy
C. a boy sat
D. a boy is sitting
All possible means ________been taken to prevent the river________．
| A．have;polluting |
| B．has; polluted |
| C．has; from polluted |
| D．have;being polluted |
The government is considering the environment-friendly plan which some scientists would like to see________soon．
| A．to be carried out |
| B．be carried out |
| C．carrying out |
| D．carried out |
________late, but also he forgot his books.
| A．Not only he turned up |
| B．Not only he turned out |
| C．Not only did he turn out |
| D．Not only did he turn up |
We'd like to do something for you________what you've done for us.
| A．in exchange |
| B．in turn |
| C．in return for |
| D．in terms of |