Sometimes people have no belief ________ his choices about their eating habits.
| A．on which to base | B．which to base on | C．to base on | D．to be based on |
The plan to be carried out next month needs________among the members of the labor union before________.
| A．to discuss；carrying out | B．to be discussed；carried out |
| C．discussing；being carried out | D．discussed；to be carried out |
It is impolite to sit there with your feet _____ at somebody.
| A．pointing | B．pointed | C．being pointed | D．point |
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 |