When taking an examination, we are usually not allowed to __________ dictionaries for the words we don't understand.
| A．look up | B．look for |
| C．pick out | D．refer to |
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 |
Going on a trip into ______ space must be quite ______ exciting experience.
| A．/ ; the | B．/ ; an | C．the; an | D．the; a |