There are several ways in which American dining customs are different from those in other parts of the world. A guest invited to

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问题     There are several ways in which American dining customs are different from those in other parts of the world. A guest invited to dinner is【B1】______to arrive on time. The use of the fork and knife is often different. The fork is used mostly in the left hand. It【B2】______the food without the help from the knife, which is generally used only to cut meat or potatoes, and is placed to the right of the plate when【B3】______And while in many places the napkin is put around the neck, here it is put【B4】______Finally, when Americans eat certain foods, they use their fingers. For example, at【B5】______they eat chicken, pizza and so on with their hands only.
【B3】

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答案in use

解析 由空格前的when推测,此处应填一个时间状语。结合录音填入in use,而该处实际是省略形式的状语从句,完整表述为when it is in use。
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