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 pressure _____ causes Americans to be energetic, but it also puts them undera constant emotional strain (过度紧张).
A.to compete | B.competing |
C.to be competed | D.having competed |
_____ it or not, his discovery has created a stir in scientific circles.
A.Believe | B.To believe | C.Believing | D.Believed |
After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys _____ to go to school.
A.to be encouraged | B.been encouraged |
C.encouraged | D.be encouraged |
There's a man at the reception desk who seems very angry and I think he means_____trouble.
A.making | B.to make | C.to have made | D.having made |
That was so serious a matter that I had no choice but _____ the police.
A.called in | B.calling in | C.call in | D.to call in |