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

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(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.

10) For economic reasons, shipbuilders have designed vessels that can be loaded and ____ in a minimum amount of time with minimum labor.

11) Laugh,and the world laughs with you; ____ ,and you weep alone.

12) A national debate is now ____ about the manner in which we as a society should protect our natural resources.