随堂演练
及时体验 巩固提升
Ⅰ.用适当的介词或副词填空
1．After wasting so much time, the boy turned ________ his study again.
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2．I don't want to go to the party, for one thing, I am preparing an examination, ________ addition I have no interest in that kind of things.
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3．As a student, you should focus ________ your school work rather than some other things.
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4．Working in so much noise can cause damage ________ your hearing.
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5．His laziness and carelessness led ________ his failure in the examination.
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6．Organic farming can keep the soil, air and crops free ________ chemicals.
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