Thank you, Don, all are good questions. Actually I'm compiling a manual for new teachers. This

Its uploaded now...rather large file. On Mar 25, 12:32 pm, Hai Yang <y050...@gmail.com> wrote:

Are you interesting in this group?

This is a interesting way to communicate among us. On Mar 24, 5:29 pm, Hai Yang <y050...@gmail.com