Cambridge - B2 - Reading and use of english - Part 2

Ears do (a)   than hear.

They keep you balanced, as (a)   .

Inside the inner ear, three small loops, or semi-circular canals, can be found. They are filled (a)   liquid and have thousands of microscopic hairs lining them.

When you move your head, the liquid in the canals also moves. This causes the tiny hairs (a)   move too, sending a nerve message telling the brain what position your head is in.

Almost instantly, your brain sends a message to your muscles, and this (a)   it possible for you to keep your balance.

If you've just been spinning around, the liquid in the canals keeps moving (a)   the fact that you have actually stopped turning.

(a)   a result, the hairs inside the canals sense movement and that is why you might feel dizzy - your brain is getting two different messages and is confused about the position of your head.

Once the fluid ...... finally stopped moving, your brain gets ..... right message and you regain your balance.

(a)