单项选择题

A. Writing papers for his classes.
B. Meeting with his professors.
C. Doing extra work in the chemistry lab.
D. Working overtime as a librarian.
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单项选择题
A. Collecting objects on the beach. B. Creating computer models. C. Mapping currents in the ocean. D. Tracking water pollution.
A. Collecting objects on the beach. B. Creating computer models.
C. Mapping currents in the ocean. D. Tracking water pollution.
单项选择题
A. He decided to attend extra history classes.B. He hopes to meet the woman at the student center.C. He was too sick to work on his paper.D. He’s been busy working on his paper.
A. He decided to attend extra history classes.
B. He hopes to meet the woman at the student center.
C. He was too sick to work on his paper.
D. He’s been busy working on his paper.
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