Students are often warned that anyone who leaves the classroom at night must remember to __________ all the lights, or he will be fined.
| A．switch off |
| B．go off |
| C．take off |
| D．bring off |
Her ambition is _____ part of the national team for the next Paralympic Games.
| A．of becoming | B．becoming |
| C．to become | D．that become |
We have the right to ________ our traditions, our heritage and our languages.
| A．deserve | B．reserve |
| C．preserve | D．prevent |
As we know, too much ________ to Xrays can cause skin burns, cancer or other damage to the body.
| A．contact | B．appeal |
| C．exposure | D．contribution |
The lesson Mr Li gave just now was too difficult for the class to ________.
| A．take up | B．take out |
| C．take down | D．take in |
The scientists recommend that studies ________ to find out what side effects the medicine might cause.
| A．be done | B．should do |
| C．will be done | D．are done |