I.Fill in the gaps with must or can’t. 1.A: Wow! Look at that man in the beautiful car. B: Yes, he … 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 10 minutes ago!