Why do students sometimes cheat?

Why do students sometimes cheat (فریب دادن)?

Teenagers (نوجوان) use the Internet very well! There are lots of good websites and lots of good things you can learn on the internet. What is your favorite (برگزیده) website?  Why is it your favorite?
     The Internet also helps us learn about other people and places. So, in a way, the Internet brings more peace and understanding to our world.  But some people, including (شامل) teenagers, use the Internet in bad ways.
     Several (چندین) questions were sent to students around the world. The questions asked students how they use the Internet. From the students' answers, teachers learned that students often use the Internet to cheat (فریب دادن) in school!  When students did not know the answer to a question on a school test, they found the answer on the Internet. But this is cheating.  
     The students were 14 to 18 years old. Of all the countries in the world, cheating happens the most in the United States!  Almost 1/3 (one-third) of all students in America have cheated on tests using their phones to connect to the internet. 

Now, let's talk about two questions:

1)  Why do you think students cheat on tests?
2)  Who does cheating hurt (ازار رساندن)?
3)  What things would help students so they would stop cheating?