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信息发布者:
were sleeping
has fallen
are printing
No, they don't.
The right hand.
I will nod to mean '' no ".
Manners and customs of different areas.
Important/Necessary/Helpful/Useful.
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      There are many great works of art in the museum. We can learn about our history and culture in it. In order to keep the museum safe and clean, it's necessary for each of us to behave politely when we visit it. 
      We should never shout or talk loudly in the museum. It will make other visitors uncomfortable. Never touch any works of art. Always queue for our turn and remember not to push in before others. Ask the workers first if we can take any food or drinks. 
      If we all act in a proper way, I think we will make it a more wonderful experience to visit the museum.