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2. keep busy doing不斷地,不停地,忙著做某事

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1. keep back  阻止...向前

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13. Every few hundred meters along the wall there are watch-towers, where soldiers used to keep _____.

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12. He walked so fast that I could hardly keep _____  _____  him.

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11. The good news keeps our  spirits _____.

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10. I see you are getting along well with your English studies.  Keep _____ the good work.

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9. The rain kept _____ all night.

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8. It is also bad manners to keep _____ when the teacher asks you a question.

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7. Will this overcoat keep the rain _____?

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6. Danger!  Keep ______!

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