I agree with the idea that students must prepare the lessons at home carefully in order to study well. First, they can make theselves more careful with both easy and difficult exercises. Secondly, when they prepare for the lessons before studying at school, they won't be embarrass when the teacher told them to answer the questions which relates to the lessons. Finally, they can improve their independence without depending on the teachers. However, many students use the Internet to suft the keys of their lessons, so they gradually do difficult exercises and also their stusies become worse. In short, students should prepare their lessons at home but not too depend on the Internet because sometimes it is wrong.