1.makesure you have r_ _ _ _ _ _a computer beforehand, or you will be interrupted
by others in the halfway you are using it.
2.Only b_ _ _ _ _ websites allowed.Websites of online games and forums are strongly prohibited.
3.Do not i _ _ _ _ _ unknown programmes.
4.Do not d _ _ _ _ _ _ _ your personal information to strangers in the Net.
5.Be aware of online crimes like f _ _ _ _ _ and h _ _ _ _ _ _ .