--It's too noisy outside. I can't hear the radio clearly.

--Let's ________.

1. A.
   turn it on
2. B.
   turn it off
3. C.
   turn it up
4. D.
   turn down it

--It's too noisy outside. I can't hear the radio clearly.

-- Let's________.

[　　]

--It's too noisy outside. I can't hear the radio clearly.

-- Let's________.

[　　]

－It's too noisy outside. I can't hear the radio clearly.

－Let's ________.

[　　]