They devoted ________ to the research of the new type of machine.

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Are they doing____ homework?

A. them  B. theirs  C. they  D. their

      is a result of the student activity survey at our school. Most students exercise three or four times      week. Some students exercise once         twice a week. Some students exercise every day.        homework, most students         homework every day. Some students do homework more than three times.          students do homework once or twice a week. The result for “watch TV” is          . Some students watch TV once or twice a week. Some watch TV three or four         a week. But most students watch TV every day.         think it’s helpful for them       TV. They can be relaxed and learn much knowledge(知识) by watching TV.