题目内容

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.

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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.

(9) I don't know what my roommate is up to because he does every-thing ____ ,either when I am away or when I am asleep.