题目：
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Write down the numbers of the topic sentences in the following passages.
（1）Americans might be embarrassed because their Japanese friends are so formal with them. （2）Japanese might feel insulted because American acquaintances greet them casually.（3） Still, the forms of greeting in both countries only show respect for others.（4） It just happens that Americans and Japanese have a different way of looking at human relationships and thus have a different way showing respect.
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