rise in carbon dioxide is causing steady increase in global warming.
A．不填; a B．The; a C．The;不填 D．A；the
In extreme weather, a worn tyre can break easily ______ it’s mended, as is often the case.
A．when B．where C．which D．that
Of all the clues they provided, ______ is of any help for solving the case of robbery.
A．nothing B．neither C．none D．no one
Boys and girls, make sure you ______ your names on the test paper before handing them in.
A．wrote B．write C．will write D．had written
Before the ladies ______ the colorful box, filled with things like books, dolls and fancy clothes.
A．was lain B．are lain C．lie D．lay
Do you believe drinking a glass of wine every day ______ reduce the danger of heart diseases?
A．could B．must C．need D．should
