Here you an excellent textbook called American English File 2 published by Oxford which you do not have to download or install in your computer, you just have to click the book or the link and that's it. Amazing, isn't it? This CD-ROM has a lot of nice exercises to practise Pre-Elementary English with grammar activities and answers to the exercises. They are really nice. I hope you take advantage of this wonderful material brought to you totally for free by teacher Christian Serrano.