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 |
Many children, __parents are away working in big cities, are taken good care of in the village.
| A．that | B．whose | C．which | D．whom |
—What’s that noise?
—Oh, I forgot to tell you. The new machine ________.
| A．was tested | B．will be tested | C．is being tested | D．has been tested |
. E-mail, as well as telephones, ________ an important part in daily communication.
| A．is playing | B．have played | C．are playing | D．play |
After he had broken the world record, Rod ____ to a restaurant to celebrate with hid friends.
| A．went | B．had gone | C．would go | D．has gone |
The traffic is heavy these days. I ________ arrive a bit late, so could you save me a place?
| A．can’t | B．must | C．need | D．may |