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. ________________________________________________________ 2. Those who wants to go with me put up your hands. ________________________________________________________ 3. The boy, his mother died last year, studies very hard. ________________________________________________________ 4. I have two sisters, both of them are doctors. ________________________________________________________ 5. We're going to visit the school where your brother works there. ________________________________________________________ 6. He is the only one of the students who have been invited to the English Evening. ________________________________________________________ 7. That is the way which they work. ________________________________________________________ 8. Those have questions can ask the teachers for advice. ________________________________________________________ 9. Who is the man who has white hairs? ________________________________________________________ 10. I will never forget the days which we had a good time together at the sea. ________________________________________________________