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4) You can't live a perfect day without doing something for some-one who will perhaps never be able to ____ you.

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5) Because the Earth is a sphere(球形),sailors ____ only can view other ships to a distance of about 13 miles before those ships seem to disappear into the horizon.

6) Johnson dismissed____ ideas lightly as no good on several occasions.

7) One tends to believe whatever one repeats to oneself sufficiently often,whether the ____ be true or false.

8) Susan told me numerous times how her sister ____ children.

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