---You could have asked your brother for help. He is good at math.
---Yes. A whole day________ .
| A．will waste | B．had wasted | C．was wasted | D．would be wasted |
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 |