1.5kW·h＝______J，9×106J＝______kW·h，500W＝______kW．
5.4×106；2.5；0.5
Don't ____ to others like that. You should ____ politely. [ ]
A. say; speak
B. speak; tell
C. say; talk
D. talk; speak
When he got home, he would find his house _______ and he didn’t know______ to do with the robot.
A．in a mess, how
B．in a mess, what
C．in mess, what
D．at a mess, how
