What the science teacher does and says ____ of great importance to college students.
| A．was | B．are | C．is | D．were |
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Look at the sign, Sir. We don’t permit _________ in the hall.
| A．smoke | B．to smoke | C．smoking | D．to have a smoke |
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— Do you know why the teacher asks for me?
— He wants you to _________ your absence(缺席) last night.
| A．account for | B．call for | C．reach for | D．send for |
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Sometimes she’d ask the driver to stop in front of a particular building and would sit _________ into the darkness, saying nothing.
| A．staring | B．glaring | C．watching | D．noticing |
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— His mother was ill and he had to look after her in hospital.
— That’s _________ he was absent from the meeting.
| A．because | B．what | C．why | D．which |
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