It was quite right for Yuan Longping to think that________was to have more rice and produce it more quickly.
| A．the key to feeding people |
| B．the key to feed people |
| C．the key of feeding people |
| D．the key of feed people |
This is the best way ______ I have thought of ______ the problem.
| A．that; solving | B．in which; solving |
| C．which; to solve | D．/; to solve |
Particular attention must be paid ______ welfare, especially in the poor area.
| A．develop | B．to develop | C．to developing | D．developing |
At this time tomorrow ______ over the Atlantic.
| A．we’re going to fly | B．we’ll fly |
| C．we’ll be flying | D．we’re to fly |
—That must have been a lot of work.
—Yeah, it us three days to finish it.
| A．takes | B．had taken | C．took | D．was taking |
______ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Having been told |