Sam________some knowledge of the computer just by watching others working on it.
A．brought up B．looked up C．picked up D．set up
If the babysitter cannot come tomorrow，do you mind________alone at home，doing his homework?
A．Fred’s leaving B．Fred being left
C．Fred’s having left D．Fred having been left
Now that you’re grown up，you’d better spend your time just on the things you find_______.
A．worth doing them B．worth being done
C．worthy of doing them D．worthy of being done
The city government is planning to build a factory to deal with the industry waste，but when and where to build it________.
A．haven’t been decided B．aren’t decided
C．hadn’t been decided D．hasn’t been decided
Though having lived abroad for years，many Chinese still________the traditional customs.
A．perform B．possess C．observe D．support
Henry would rather that his girlfriend _________ in the same department as he does.
A．worked B．works C．had worked D．would work
