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6. The rainfall is increased across South America, ________ floods to Peru.

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7. While enriching their imagination, books _______ their outlook,develop a fact-finding attitude and train them to use leisure properly.

8. That’s why a growing number of hospitals now depend upon physicians who _________ in pain medicine.

9. Rats are often with spreading disease rather than preventing it. (以字母a开头,表示与……相关联)

10. This is one of the first studies that have to measure their impact over such a long period of time. (以字母a开头,表示尝试做某事)

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