Прошу помочь с английским

1.At first the Internet was mainly used by scientists.
When was the Internet used by scientists?
What was mainly used by scientists at first?
By whom was the Internet mainly used at first?
2.You don't need a CD to send email.
Who doesn't need a CD to send email?
What don't you need to send email?
What don't you need a CD for?
3.They've already got a website.
Who has already got a website?
When have they got a website?
What have they already got?
4.That isn't a computer virus.
What isn't a computer virus?
What isn't that?
Which kind of virus isn't that?
5.Bob likes sending emails to his friends.
Who likes sending emails to friends?
What does Bob like to do?
To whom does Bob like sending emails?
6.I can pay for my ticket through the net.
Who can pay for a ticket through the net?
What can I pay for through the net?
For whose ticket can I pay through the net?
7.Surfing the net for information is so exciting.
What is so exciting?
What is surfing the net exciting for?
How exciting is surfing the net for information?
8.She won't download all those documents.
Who won't download all those documents?
What won't she do with all those documents?
What won't she download?