问题描述：
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.
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.
问题解答：
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