Circle the correct word or phrase

Circle the correct word or phrase. If both are correct, circle both.
1. Did you hear a noise?
    THAT'LL / THAT MUST probably be the cat.
2. I had to walk all the way here.
   You must BE / HAVE BEEN exhausted. Put your feet up. I'll make us a nice cup of tea.
3. Your favourite programme's on.
    It MUSTN'T / CAN'T be. It's only half past five.
4. Andy made me redo every single one of the reports.
    You MUST / CAN have been furious.
5. Laura walked right past me in the street without saying a word.
    She CAN'T / COULDN'T have seen you.
6. I can't believe I got the final question in the pop quiz wrong.
    Don't worry. I WOULDN'T / WON'T have known the answer either.
7. I can't wait to get that blue top tomorrow.
    I wouldn't get too excited. They only had one left, so they MAY / MIGHT well have sold out.
8. It's very cold.
    Yes, I think it MUST / MIGHT easily snow tonight.
9. I can't wait till Roger gets here!
    He should LAND / HAVE LANDED by now, so he'll be here in about an hour.
10. I hope they've got some tickets left.
     We SHOULD / MIGHT just be lucky and get the last two.