Choose the correct modal verb
A: You [don't have to|shouldn't] spend so many hours in front of the computer. It's bad for you.
B: I know, but I [have to|should] finish this report. My boss wants it by 9 am tomorrow.
A: Is that my mobile phone ringing?
B: Leave it. You [mustn't|don't have to] talk on your mobile phone while you're driving.
A: Sam! You almost knocked over that vase! You [must|ought to] be careful when you're playing the Wii!
B: Oops! Sorry.
A: You [may|must] go now. We've finished for today.
B: Thanks. I'll see you tomorrow.
A: I didn't get the chance to say goodbye to Zack before he left for the airport.
B: Then, you [have to|should] send him a text message.
A: He's suffering from shoulder strain again.
B: He really [may|must] see a doctor.
A: Ben [has to|should] share his laptop with his brother.
B: Oh, poor him!