They became friends again that day. Until then, they __________ to each other for nearly two years.
| A．didn’t speak | B．hadn’t spoken |
| C．haven’t spoken | D．haven’t been speaking |
We have overlooked the fact __________ the children’s emotional development may be easily damaged.
| A．which | B．that | C．what | D．不填 |
In Mark’s speech, he made the point __________ far more people died from smoking than from taking drugs.
| A．where | B．what | C．which | D．that |
It is already well understood___________ causes the global warming.
| A．what | B．when | C．how | D．that |
___________we’ll go camping tomorrow depends on the weather.
| A．If | B．Whether | C．Where | D．That |
_________he said at the meeting astonished everybody.
| A．It | B．That | C．What | D．The fact |