填空题

Subject:	Email
Usage:	A mode of ______;	1
	In business settings, it is best used to convey key information, to confirm ______; to document decision; to contact a decision maker directly.	2
Tips for you to improve your digital message.	Never say something about someone else that you would not want that person to see.
	Take time to think about your ______ line.	3
	Avoid using all ______ letters in your messages.	4
	Be careful about any use of sarcasm and ______.	5