Tourist visa for china. I have the following questions:

1) can i apply by e mail for the entry permit?
2) do I have to book an interview or can I just turn up at the embassy and submit my application?
3) Is it possible to submit my application in person and pick the visa on the same day?
4) Do you return the visa by post if I include an envelope.
5) I need to be in China before the 25th August