1. ?????most people like to sleep approximately eight hours a day, researchers believe we can survive comfortably on half that much.1) As we know that
2) In spite of the fact that
3) Whenever it looks like
4) Even so it seems to be
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2. One of the great technological innovations in the last two hundred years was the process of refining oil into gasoline????., the internal combustion engine would not have been practical and cars might not have been developed.1) Without this
2) As a result
3) Because of this
4) For example
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3. People who live near the sea usually ??. to swim.1) knew whether
2) have known when
3) can know why
4) know how
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4. Before 1960, some people believed that, for the most part, intelligence was innate or inborn. In other words,??..and nothing would change that.1) you could think globally and logically
2) you could develop your expertise successfully
3) you had very good memory and were well trained
4) either you were born smart or you weren´t
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5. The world relies heavily on fossil fuels, yet other excellent sources of energy???? Hydroelectricity, for example, is a very attractive from of energy.1) offer a lot of disadvantages
2) cannot be replaced
3) have already been developed
4) are much less efficient
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