Excellent!
You managed to get three out of the four books. The last one was published only recently so it is a bit harder to find. Go tomorrow to the bookstore where you bought your schoolbooks last year, it will be there or arrive shortly after you.

Now do three things:

1) Spread the books around your appartment. Put one by your bed, one in the kitchen and one in the bathroom. When you get the fourth one put it next to the TV remote.

2) E-mail your mother and tell her that for her birthday next month you are going to make her a website to use in her teaching. Ask her to select the domain name for her site.

Chao, Albert