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    20. Dry stone walls, when properly __________, will last several lifetimes.

    　 A. is built　　 B. building　　 C. to build　 D. built

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    19. A recent research indicates that __________ when they are greatly encouraged by their parents, will the kids improve their ability of dealing with problems.

    A.　　 only　 　B. just　 C. Still　 D. yet

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