People tend to..., speak quietly when people are studying in the library., You're supposed to..., remove your hat when entering a place of worship., You're expected to..., send a message if you're going to be late for dinner., It's considered polite to..., bring a small gift when you're invited to someone's house in many cultures., It's considered unacceptable to..., push in front of other people while they are waiting in line., You must..., respect the speed limit when driving., You mustn't..., take photos in museums where photography is forbidden., The usual thing is to..., shake hands after a business meeting, although this depends on the country., You're not meant to..., wear muddy shoes inside someone's home.

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