Amy is playing _______ piano, but Chen Jie is playing ______ chess. A. the; the B. the; / C. / ; the
( ) 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
( )We must ______ and wait at a red light. A. stopping B. stops C. stop