David threatened_____ his neighbour to the police if the damages were not paid. 
| A．to be reported | B．reporting |
| C．to report | D．having reported |
It was 80 years before Christopher Columbus crossed the Atlantic _Zheng He had sailed to East Africa．（2012．重庆）
| A．when |
| B．that |
| C．after |
| D．since |
It was not until I came here I realized this place was famous for not only its beauty but also its weather. (2012 .安徽)
| A．who |
| B．that |
| C．where |
| D．before |
--- Do you think I should buy that camera？
--- The price is reasonable and new arrivals are seldom on sale. It is really a bargain.
| A．What for? |
| B．How funny! |
| C．Why not? |
| D．How come? |
A huge balloon is telling people in Paris how good or bad the air quality is. When it’s good, the balloon shines green. ,it’s red.
| A．When worse |
| B．If bad |
| C．Though terrible |
| D．Whenever good |
The intermission between halves in certain games, such as basketball or football, is an interval,the audience can buy ice-cream.
| A．when |
| B．where |
| C．as |
| D．which |