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短文填空 This is a street crossing,There are red and green( )at

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短文填空
This is a street crossing,There are red and green( )at each corner.Drivers must( )the lights carefully.
( )there is a green light.the cars may go.When there is a red light.the cars must( ).They must wait until the red light changes to( ).Then they can go on.Sometimes the cars want to ( )a right turn or a left turn.They can make a right turn when the light is green,But they must( )until the green light is shining is ther want to turn( ).
Some people are color-blind.They can not tell the difference between the red and green lights.These people must not( ),or there will be accidents.We must keep our streets( ).
短文填空 This is a street crossing,There are red and green( )at
lights
watch
when
stop
green
make
wait
left
drive
safe