Complete the exchanges, choosing the correct modal verb

A: I'm freezing!
B: You ... bring a warm jacket with you.
A: Would you like to come shopping with me?
B: I'd love to, but I ... finish my history project.
A: Have you seen Jane?
B: Not really. She ... be in her room doing her homework but I'm not sure.
A: I thought I saw Sam two days ago.
B: You ... have seen him. He's been away on holiday for over a month.
A: It hurts so much.
B: You ... have broken your arm.
A: I was really bored last night.
B: You ... have come to the theatre with us. We enjoyed it a lot.