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11.A. for        B. to        C. at        D. with

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10.A. serious      B. harmful.   C. dangerous D. helpful

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9. A. by         B. across    C. through    D. against

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8. A. For         B. Until      C. When    D. Since

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7. A. easy        B. small      C. large      D. light

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6. A. found       B. invented   C. called     D. bought

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5. A. takes       B. helps      C. gets       D. brings

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4. A. in         B. to        C. by        D. over

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3. A. also        B. but also    C. too       D. either

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2. A. twenty-first   B. twenties  C. twelfth    D. twentieth

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