短文综合填空。
Do you know what American students have to do in their school? In America, at the beginning of the term, students must choose their c____ and teachers first. While in China students usually have no chances（机会）to choose.
C____ is very important for your grades in America. So at the first term, don't choose too many courses, o____ you'll feel very nervous and it may influence your study. Then you have to ask for some teaching plans. There is some information about subjects, time arranging (安排), marks and t____. At the same time, you must choose the teachers. Different teachers have d____ teaching ways. If the teacher is called "killer" by the last grade, many students will give up choosing him. Because this kind of teacher will leave too m____ homework, too many exams and give too low grades.
There is a____ thing after you choose the courses and the teachers. It is hard for each student to buy textbooks. The textbooks in America are very e____. Each copy is about $30~50. In order to save money, many students buy some used textbooks, and some students usually borrow textbooks f____ the school library. You must get ready before classes. In class, discussing is very important. The teachers e____ you to raise questions or show your own opinions. They don't usually ask you to sit well. I____, they allow you to sit or stand everywhere you like. They don't give you much homework to do. You can learn some knowledge and do exercises by yourself.
