Prohibition and obligation

In the UK you can leave a tip in the pub if you want, but you _____.

I'd love to come to the cinema but I _____ hand in this assignment tomorrow.

You _____ memorise the whole thing. Just try to remember the key points.

I _____ forget to take my library books back on the way home.

(Notice on a train) Quiet carriage. Passengers _____ play music or talk on the phone in this part of the train.

You _____ be a member to buy a ticket. It's open to everyone.

I'll _____ wear the black dress tonight. The invitation said formal clothes.

I did this yesterday – I can help you! You _____ fill in the form and attach an up-to-date passport photo.

(Airport notice) Liquids _____ be in 100ml containers and in a closed plastic bag.

You _____ do your homework before watching television.