The room is dark. Please turn _____ the light.[ ]

Can you work out the maths problem? —Sorry, I can ______ understand its meaning.

How delicious the coffee is!—That’s right. It will taste ______ with milk.

When I was very young, I thought that inside the radio ______ who liked talking very much.

Haven’t I told you that you should get home earlier?—Yes, but I __________ home earlier than I usually do.