题目内容

Agriculture used to be the __________ (economy) backbone of this country.

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There is a direct __________ (relation) between exposure to sun and skin cancer.

It was a __________(wonder) occasion which we will cherish for many years to come.

Graduate school is one way to get specialized knowledge, although __________ (extend) college education isn’t always a good investment from a purely economic standpoint.

If you should be fired, your health and pension benefits will not be __________ (automatical) cut off.