Once your business because international, _____constantly will be part of your life.
| A．your fly | B．your flight | C．fight | D．flying |
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 |
An advertisement is useful in ________ it lets customers know of the kinds of goods in the shops.
| A．that | B．which | C．what | D．whether |