. Please remain __________ until the plane has come to a complete stop.

Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night．

China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boats from _______ in the South China Sea.

___________ your car unlocked outside means ___________ trouble. 

________in the computer games，the boy no longer put his heart into study.