Unit 一 词汇运用(20%)Martin_(过去) to be a “problem child”. But he didnt usually give his mother much trouble. However, after his fathers _(死), Martins life became much more difficult. His mother couldnt _(负担) his education. To do this, she had to work hard, and so she was often not at home. His mother looked after him as _ (好)as she could. _(不幸地) ,Martin still _(造成) problems for himself and his family. He was not _(感兴趣) in studying and he often g