[ Grammar ]
Sarah Frances Whiting opened the —- of physics in the United States in 1878.
A. undergraduate teaching was in a second laboratory
B. second teaching laboratory of undergraduate
C. undergraduate teaching laboratory was second
D. second undergraduate teaching laboratory

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a. How
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Each of the students (is/are) responsible for doing his or her work.
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A. Where did she buyed her new jeans?
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By the time we got there, he _______________ .
A. have left
B. has left
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