1.When he was a boy,he was interested in hiding and seeking.2.The students should't spend many time on watching TV.3.Now that your body is not good, so you should take care of yourself so soon.4.Since six months before the exam, they had been to study.5.He has been a member for two years.1.有希望就有办法。2.在他观光中国前,他就已经自学中文两年了。3.他越谈论他在中国的所见所闻,他就越兴奋。4.杨先生给了我们一些关于如何做一个好学生领袖的好建议。5.我们惊讶的是,这个小男孩仅用15分钟就算出了这道数学问题。