All the children on the playground stared up into the sky until the noise
of the plane _________.
| A．gaveup | B．wentout | C．diedaway | D．tookoff |
A person who has never tasted bitter won’t know ______ sweet is.
| A．which |
| B．what |
| C．when |
| D．why |
--- The professor gave a really good speech.
--- I suggest you ______ him some specific questions about his work experience.
| A．have asked |
| B．will ask |
| C．asked |
| D．ask |
The agent promised to keep the family members fully ______ of any developments.
| A．inform |
| B．informing |
| C．informed |
| D．being informed |
It was unusual that such close neighbors ______ not know one another.
| A．could |
| B．would |
| C．must |
| D．should |
It’s always hard to remember a name when one doesn’t have a face to go with ______.
| A．him |
| B．it |
| C．her |
| D．one |