There is a widespread belief among the science world ____ we keep on _____ the earth as we are doing today, the exist ence of us humans on this planet will be out of the question in some years yet to come.
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A. if; polluting B. if; to pollute C. that if; to pollute D. that if; polluting
_____we are not attacked by nuclear weapons, we promise that under no circumstances _____ use the bomb first but we reserve the right to use it for counter-attack when necessary.
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A. As long as; we shall B. If; shall we C. So long as ; shall we D. Even if; we shall