Fill in the gaps with must or can't.
1. A: Wow! Look at that man in the beautiful car. B: Yes, he ...must... be very rich.
2. A: I passed my exam! B: Congratulations. You ... be very happy.
3. A: Aunt Sheila's dog died. B: Oh no. She ... be very sad.
4. A: That woman always wears smart clothes and lots of jewellery. B: I know. She ... be poor.
5. A: I've been working all day without a break. B: Sit down, you ... be really tired.
6. A: I've finished tidying my room. I'm ready to leave now. B: You ... be ready so soon! You only started ten minutes ago!

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