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5. The British are rather particular ______ table manners.

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6. If it is simply an invitation ________ an evening meal and conversation, you will probably take your leave between ten and eleven o clock.

7. If you have been asked to stay several days, you will conform as far as possible the routine of the house.

8.The same principle applies old people. If they are respected in Britain, it is because they are felt to be need of protection and support.

轴测投影根据投影方向与投影面的角度不同，分为正轴测和斜轴测两大类。最常用的轴测图为_和_。