Without facts, a person can not form a correct opinion, for he needs to have actual knowledge ______his thinking .
| A．on which to be based | B．on which to base |
| C．which to be based | D．which to base |
What can we do for them _____ for all the help they have given us?
| A．in turn |
| B．in return |
| C．by turns |
| D．out of turn |
He was _____ upset by the accident.
| A．rather than |
| B．less than |
| C．more than |
| D．other than |
He _____ his pockets but failed to find his wallet.
| A．searched for |
| B．in search of |
| C．searched |
| D．looked for |
-John will probably be late, won't he?
- _________________________.
| A．No problem |
| B．No wonder |
| C．No doubt |
| D．No time |
They told me that the museum was well worth _______.
| A．to visit |
| B．visiting |
| C．of being visited |
| D．to be visited |