Teaching Aids

Disclaimer:
Following are files for my own keep and to share with friends only, totally not for commercial use.
Please click at the title below to view / download. If you're interested to download those files under type "PAID"  (those that I actually bought online) ,  due to copyrights issue, you're welcome to contact me and I'll reply you with the access code through email. What I want back is just your sincere friendship in return :-)