（1）Street cleaners start work very early when most of the people

in bed.
（2）They sweep the streets，collect rubbish and

the rubbish bins.
（3）Before the streets become very

in the morning，they have finished their work.
（4）We can make their work easier by

our rubbish in the street.
（5）We should also park our cars in the parking lot

in the street.