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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 got 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.
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