Welcome!
Please click on your class's site and you will be redirected. There, you will find additional practice, exercises and explanations of the structure and vocabulary for each unit.
By clicking on the links, a new window will open and you will be able to do the activities and practice. Once you finish your practice, simply close its window to return to your class's site and continue with the next exercise or navigate away from the page to continue with your normal web surfing.
I hope you find this site interesting and useful to you.
Regards,
Mike