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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( ).
lights
watch
when
stop
green
make
wait
left
drive
safe