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concerned connected conducted concluded
why it does what he does how it is what it is
It was while As soon as While During the time when
Who Whoever What Whatever
酶具专一性 酶的成分是蛋白质 酶的活性受环境影响 该沉淀是氨基酸
/, the the, the the, a /, a
Unless If Because Although
transmitted transported transplanted transformed
themselves each other himself herself
全面加强政府对经济的干预 确保美国的世界霸权 顺应第三次科技革命的要求 扩张美国的领土
Whether Though Until Unless
must be can’t be must needn’t be
Did they? Why not? Did they? Why didn’t? Haven’t they? Why? Didn’t they? Why not?
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