1.Let's cheak the net
2.He create an anti-virus program every day
3.Luke never save a backup of his flies
4.My parents send an email to my aunt every week
5.Can you run this CD for my friend?
6.Let's burn the hard disk for viruses before we go to the computer shop.
7.How often does Martha click her flies on hard disk?
8.You surf with the mouse on the file to open it
Chúc học tốt:))