小医生，下列各句均有一处错误，请找出并改正。

1.Help yourself to some chicken,children.

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2.He is very young,and he knows a lot.

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3.His mother teach him at home when he was young.

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4.Because he is too young,so he can't lift the box.

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5.The children enjoyed them in the park.

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患者女性，25岁，左臂被玻璃划伤2h来急诊。查体发现左前臂伸侧一长约4cm伤口，周围有少许油污。在清创室，麻醉师已经进行左臂丛神经麻醉，现请你实施清创和缝合伤口（在医学模拟人上操作）。