请找出下列各句中的错误并加以改正。

1. The reason which he didn't go to school is that he was ill.

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2. Those who wants to go with me put up your hands. 

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3. The boy, his mother died last year, studies very hard. 

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4. I have two sisters, both of them are doctors. 

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5. We're going to visit the school where your brother works there. 

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6. He is the only one of the students who have been invited to the English Evening. 

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7. That is the way which they work. 

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8. Those have questions can ask the teachers for advice. 

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9. Who is the man who has white hairs?

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10. I will never forget the days which we had a good time together at the sea. 

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