People usually use s_ to show what you must and mustn't do

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• 阅读英语短文,We can see many traffic signs on both sides of the roads or streets.Some tell the drivers what to do,and others tell them what not to do.The traffic signs are the traffic rules.All people must obey the rules and mustn’t break them.　　Each traffic sign has its meaning.Do you see the sign “P”?Do you know its meaning?　　In big cities,there are a lot of cars,trucks and buses.They can’t stop on the streets at any time.If a driver wants to stop his car
• People usually use s_ to show what you must and mustn't do填什么?快
• People usually use s_ to show what you must and mustn't do
• what must or mustn't you do when the fire danger high
• Do what you must do and what you want to do!表达正确吗