The boy was so careless that the glass fell from his hand and it ______ on the floor. [ ]

下列各句中，没有语病、句意明确的一项是

cording to the regulation, all _____should be examined before boarding a plane.

en stood up indefence of the 16-year-old boy, saying that he was not theone

Unemployment in that country is likely to remain high in 2011, and ____ for the next few years