Though Einstein was a great scientist, many of his ideas______today and are being modified by the work of todays scientists.
A．are to challenge
C．may be challenged
D．have been challenged
Once environmental damage_____, it takes hundreds of years for the system to recover.
B．is to do
There are three times as many graduate students in our university ______ in yours.
B．as the same
When filled with a gas______ lighter than air, a balloon becomes buoyant and rises.
With the possible exception of equal rights, perhaps the most【C1】______ issue across the United States today is the death penalty. Many argue that it is an effective deterrent(威慑)to murder,【C2】______ others maintain there is no convincing evidence that the death penalty reduces the number of murders. The principal argument【C3】______ by those opposed to the death penalty, basically, is that it is cruel and inhuman punishment, that it is the mark of a【C4】______ society, and finally that it is of questionable effectiveness as a deterrent to crime anyway. In our opinion, the death penalty is a【C5】______ evil. Throughout recorded history there have always been those extreme individuals in every society who were【C6】______ of terribly violent crimes such as murder. But some are more extreme than others. For example, it is one thing to【C7】______ the life of another in a fit of blind rage, but quite another to coldly plot and【C8】______ the murder of one or more people in the style. of a butcher. Thus, murder,【C9】______ all other crimes, is a matter of relative degree. While it could be argued with some conviction, that the【C10】______ in the first instance should be merely isolated from society, such should not be the fate of the latter type of murderer.
We dont have more computers in stock, or we______your order immediately.
In a different political situation, workers______the right to go on strike.
A．have not gotten
C．might not have gotten
D．might have gotten