It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.
| A．process | B．attention | C．measure | D．part |
—Whydoyou hang that photograph above the fireplace?
— ______ visitors of the memorial days of Long March，Sir.
| A．Reminding | B．To remind | C．Reminded | D．Reminds |
______ is surprising to us is that Tom, for ______ English was once boring, can speak English fluently as though he were a native speaker.
| A．What; whom | B．What; whose | C．It; whose | D．As; whom |
Bad habits are no way easy to be ______; it needs your determination and perseverance.
| A．replaced | B．moved | C．removed | D．got rid |
What a pity! Considering his ability and experience, he ______ better.
| A．need have done | B．must have done |
| C．can have done | D．might have done |
They advocate the proposal we were opposed ______ rediscussed at the next meeting.
| A．to be | B．should be | C．to was | D．was |