英文勁人請進!

I like to give people second chance;
However, nobody sees me with just a glance.
I am wet and yet I am dry;
If it's on white, give me a try.

Right & Wrong

When you're right, you always forget me. : (
When you're wrong, you'll think of me and use me. : )
But after you use me, you may not become right. : I

Q: What am I?
You need me when you are wrong
You shake me before you use me
You make me cover up for you when you've done something wrong
You don't like me when I poop too fast
You hate me if I don't poop at all

A: Tip-ex

你係咪想我地諗題英文既iq題...答案要係塗改液??