Hotel guests ____ smoke in their rooms. It's not allowed. Users don't ____ to put a photo on their web page, but it's a good idea. My sister doesn't have ____ study a foreign language at her school -- they're an option Passengers ____ take liquids on the plane. It's not allowed. Your son mustn't ____ more than 6 pills everyday. That's the maximum. I don't have to ____ a suit to work. I can wear jeans if I like.

must / have to

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