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16.A.to require  B.required     C.requiring      D.are required

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15.A.predict    B.acknowledge  C.argue         D.ignore

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14.A.before    B.after        C.while         D.for

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13.A.evaluate   B.acquaint     C.tackle         D.formulate

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12.A.independently           B.repeatedly      C.logically    D.generally

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11.A.enable    B.stimulate     C.advocate       D.prevent

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10.A.Because   B.Though      C.Whether       D.If

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9.A.effective   B.passive      C.relative        D.expressive

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8.A.prevent    B.require      C.assist         D.forbid

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7.A.teachers    B.classmates    C.partners       D.students

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