DavidBurbridge

• Now,they have a big election to decide center position when dancing or singing at TV.
• Now, they are having a big election to decide the center position when dancing or singing on TV.

ポプカ
Your English is very good for someone so young. Well done. (^.^)v

Maha

• And I found a boy who is classmate at my school.
• And I saw a boy who is a classmate at my school. Or, you could connect this sentence with the last one: "Today I went to the bookstore and I saw a male classmate of mine." You don't need to say 'at my school' because the word 'classmate' already implies that.