COMPACT B1 U5: COULD/MAY/MIGHT and MUST/CAN'T

CHOOSE COULD/MAY/MIGHT or MUST or CAN'T:  I've bought a lottery ticket. I ______ become a millionaire! Fingers crossed!

CHOOSE COULD/MAY/MIGHT or MUST or CAN'T:  My key's not in my pocket or on my desk. I'm sure  it _____ be in my purse.

CHOOSE COULD/MAY/MIGHT or MUST or CAN'T: Someone told me that Mark was in Mexico. But I saw him yesterday in Aranda, so Mark ______ be abroad.

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