She found a book in her basement（地下室）. It was an old book. She opened the book. It was a library book（图书馆的书）. It was an old library book. The library card（图书证） was inside the front cover（封面）. The due date （还书日日期）was on the library card. She looked at the due date. The due date was 30 years ago! Oh my goodness, she thought. I wonder how much money that is, she thought. I wonder how much money I owe（欠，应还）. She didn't know what to do. She thought about it. I can just throw the book out, she thought. No one will know. No one will know if I just throw the book out. She threw the book out. She threw the book into the trash can（垃圾箱）. She thought about it. She felt bad. I shouldn't throw a book into the trash can, she thought. She took it out of（拿出） the trash can.