Without facts, we can't form a worthwhile opinion, for we need to have factual knowledge ______ our thinking.
| A．which to be based on | B．upon which to base |
| C．which to base upon | D．to which to be based |
We were really worried about you, you________ home without saying a word.
| A．shouldn’t have left | B．shouldn’t leave |
| C．mustn’t have left | D．couldn’t leave |
Eight dollars for just a cup of coffee? I’m afraid you got________.
| A．held up | B．ripped off |
| C．cut off | D．stuck in |
The teacher made a request that all the homework_______ before class.
| A．should hand in | B．must be handed in |
| C．be handed in | D．were handed in |
The key______ the problem of traffic jams is to pay the “ congestion charge” ______ by the mayor of London.
| A．to solving; introducing |
| B．to solve; introducing |
| C．to solving; introduced |
| D．to solve; introduced |
----- Will 2000 yuan_______ the cost of the damage ?
------ I’m afraid not. I need at least 5000 yuan.
| A．cover | B．do |
| C．include | D．afford |