——Do you think it necessary that he ________ to Miami but to New York? ——I agree, but the problem is ________ he has refused to.
________ makes mistakes must correct them.
We must take steps to prevent the __________ world population.
The amount of money that he saved reached _________ 30000 dollars.
It is pretty well understood_______controls the flow of carbon dioxide in and out of the atmosphere today.
Mary got into acting purely _____________.