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.
Complete word list from Mandarin Companion's "The Secret Garden" 《秘密花园》 Graded Reader Level 1. Word list in order of frequency.
Mandarin Companion Level 1: The Secret Garden《秘密花园》, published in 2013 by Mind Spark Press LLC. List contains 4 sections and 410 words.