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5. He deposited his case in the _________ (luggage) section.

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6. We cannot exist without (air), (food), and (water).

7. Some tribes migrate with their cattle in search of fresh _________ (grass).

8. Each center could provide ___________ (information) on technology.

照明开关按安装方式分为（）和暗装，按控制数量分为（）、（）、三联等。