1.Stop signs tell cars to stop.This forgot to stop and crashed.Is the driver ​in t( )now?
in t( )now?Yes,he should have read the sigh.
2.Some signs are numbers.The numbers on your house tell where you live.The numbers on your library books are k( ) in the library.
3.Some sighs have no words or numbers.They use pictures instead.People a( ) on what these pictures mean so everyone can understand them.