Looks like the Great Firewall or something like it is preventing you from completely loading www.skritter.com because it is hosted on Google App Engine, which is periodically blocked. Try instead our mirror:
This might also be caused by an internet filter, such as SafeEyes. If you have such a filter installed, try adding appspot.com to the list of allowed domains.
To build up Chinese reading and writing skills through this set contains 2 volumes from basic level to intermediate level.
Practical Chinese Reading and Writing 1, by National Taiwan Normal University. Published in 2010 by Cheng Chung Book Co. 1st Edition. List contains 14 sections and 631 words. ISBN: 978-9570918762