问题描述：
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There are many busy streets in Shanghai.During the holidays the streets are full of people.B( ),cars and trams m( ) slowly along the streets.People can't walk quickly.When there is a red man,they w( ) on the pavement.O( ) cars,buses and trams can go.When there is a green man,they cross the road.People c( )park their cars in the street.When people cross the road,they always lood left then right.They can't play in the street.
There are many busy streets in Shanghai.During the holidays the streets are full of people.B( ),cars and trams m( ) slowly along the streets.People can't walk quickly.When there is a red man,they w( ) on the pavement.O( ) cars,buses and trams can go.When there is a green man,they cross the road.People c( )park their cars in the street.When people cross the road,they always lood left then right.They can't play in the street.
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