Should or shouldn't

Listen to that music! Our neighbors (a)   play music that loud at this hour.

If your tooth is still hurting you tomorrow, you (a)   go to the dentist's.

Cathy (a)   keep ringing her ex-boyfriend. I think he is with another girl now.

Before going to Paris for your holidays, you (a)   try and learn something of the language. You will enjoy things a lot more.

You (a)   always knock on the door before entering. This is a private office.

We (a)   bring something to Kate's party. I'll feel really embarrassed otherwise.

That model on the TV is too skinny. She (a)   eat more, I think!

Lizzie (a)   ask Bryan to help her with her studies. He did the same course last year.

Pregnant women (a)   smoke as it can damage the baby.

We (a)   leave too late tomorrow if we want to reach the beach before lunch.