Last year, a lot of air ____ took place in America.

I had to ____ one of my email accounts as it was filled with junk mail.

It was reported the president had _____ to fight if war was necessary, even if it meant destroying his chances of re-election.

Darwin＇s theory of evolution remains _____ partly because it challenges the religious belief that God created man.

The best way to deal with problems at home is to talk things out calmly and honestly and try to reach a(an) ________.

Mr. Smith is not doing well; the doctor told us that several colds ________ his health.

Unemployment has come down slightly, but this does not ________ the fact that it is still a problem.

Many power stations have been modernized to give off less pollution, or they were moved further away from the living areas in order to ________ the damage.

Testing students by examinations has long been regarded as a reliable way to ________ students＇ ability.

They are such a(an) ________ family-they must have been shocked when their son dyed his hair pink.

Studies ________ that children who often take part in cooperative programs benefit a lot more than other children,