1. The big one goes to Xinhua Bookstore, which is more comprehensive. Although they may not find exactly the same, there are many similarities, and they may not all copy the teacher's exercises. There may be a mistake. What I bought is better than what he recommended.

Every big city has a cultural market or shopping mall, where there are many books to learn besides novels. I remember there is a big one in Suzhou, and many schools around it go to wholesale and sell it to students.