1. Once the virus enters the bloodstream, it is carried to the liver??..it penetrates a cell and begins to multiply.1) when
2) for
3) where
4) that
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2. ???., people today are living much longer than their ancestors.1) Despite modern medical science and technology
2) Having benefited from medical and nutritional advances
3) By living in a world full of industrial pollution
4) Because of working hard and having stressful lives
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3. This homework is optional, ?????.1) you must not do it
2) either you do it or you fail
3) you should do it now or later
4) you don´t have to do it
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4. Dear Abby : I am a high school student. I´m a pretty good boy-I get good grades, do the laundry, etc. I asked my parents if I could get my tongue pierced,??. Don´t you agree my parents are being unfair and unreasonable?1) My mother said she would never change her mind
2) They won´t consider it
3) Most of my friends didn´t get A´s
4) I just got my report card today and I got all A´s
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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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