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19.Vitamin D helps our bodies make a special chemical,and this special chemical, ______

affects our brains,making us feel happy.

    A.in turn                      B.in particular              C.in advance         D.in short

20 Helen devoted herself ________to her research and became a top scientist in the field of applied physics.

    A.seriously                     B.extremely               C.entirely          D.strictly

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18.Everyone must have known the death of the waitress, __________?

    A.must they   B.mustn't they     C.haven't they   D.have they

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17.一 Tony is such a selfish person.

    一 I agree. Never again ________ with him. ks**5u

    A.1 will deal   B.I do deal      C.will I deal    D.do I deal

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16.After driving for 20 miles,Jackson realized that he ________in the wrong direction.

    A.was driving                    B.drove       

    C.had been driving                  D.had driven

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15.We know it is hard to make such a decision _______he has just built up the team for a year

and the project is going through the important stage now.

    A.that                      B.as      

    C.when                     D before

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