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

How much do you need ______ that bike?

Please remember, kids. ______ careful you are, _______mistakes you will make. —We know, Mr. Li.

He eats ________ food, so he is _________ fat.

I rang you at about ten o’clock, but there was no reply. – Oh, that was probably ________ I was seeing the doctor.