( ) Please ______ ! The light is yellow now.
A. slow down and stop B. wait C. go
( ) We must ______ and wait at a red light.
A. stopping B. stops C. stop
（ ）The bus is _________ .
A. coming B. come C. comes
（）You must look right_________ you cross the road.
A. before B. at C. on
（ ）We must pay attention _______the traffic lights.
A. at B. to C. in