You get a point _______ you answer a question correctly. Which is WRONG?

David lives on the ________ floor. It is too high, so he has to take a lift every day.

_________I borrow your lighter for a minute?—Sure, no problem. Actually, you _________keep it if you want to. I’ve given up smoking.

I prefer to have a hamburger rather than________a glass of milk.[ ]

I was scared _______ when I saw the tiger jumped out of the cage and ran to the little child.