What's the matter? Should / shouldn't

It's a jellyfish.

It's a socket.

You should put a plas..er on a cut.

Karen has got a fever. She ... go to the doctor.

You ... go near the fire. It's dangerous.

Tom has got toothache. He ... eat sweets.

It's hot here in the sun. You ... put some sunscreen on.

- I've got a sore throat.

- You ... drink some warm tea.

Anna has got a headache. She ... play the drums.

- What's the matter?

- Should Bill eat before swimming?