Complete the gaps in the sentences with the modal verbs.
must, may, may not, might, might not, could, can't

1. She goes out every evening. She … have a family. 2. He looks depressed he … be having some problems. 3. This woman looks like a politician. She … work for the government. 4. He’s got a very nice sun tan. He … be working in an office all day. 5. Her clothes are all very expensive. She … be earning a lot of money. 6. He often goes abroad. He … be working for the Secret Service.