Modal verbs (probability and deduction)

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I've bought a lottery ticket. There's a chance I'll become a millionaire! I ______ become a millionaire!

may/could/might

My key's not in my pocket or on my desk so I'm sure it's in the drawer. My key's not in my pocket or on my desk so it _____ be in the drawer.

must

Someone told me that Mark was in Mexico but I saw him yesterday so I'm sure he's not abroad. Mark ______ be abroad.

can't

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