下列句子中均有一处错误，请找出来并改正。
1．改错：What's happened to you?
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2．改错：I've get a new friend.
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3．改错：Some English child came to China last week.
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4．改错：He bumped he head.
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5．改错：Always wash your hands after you eat and after you go to the toilet.
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