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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