Work in groups. Can you solve these riddles?

What is in the middle of both America and
Australia?

There are three words in the English language that end
in the letters g e R two hungry? and evil You
Yeah, you use it every day, and you should
a lot of it to be successful in their studies and school
activities cars and computer and many other things
need this, too.

What is the third word?
what two words contain thousands of letters?