It __________ Tom that parked the car here, as he is the only one with a car.
| A．may be | B．might have been | C．must have been | D．could be |
Although metals ________widely in qualities such as strength and hardness，they all have certain qualities in________.
| A．vary；general | B．differ；common |
| C．react；particular | D．refer；detail |
________him that she would fail as she was so able and worked so hard.
| A．It never occurred to | B．That never occurred to |
| C．It never occurred with | D．That never occurred for |
____ she finds out that you’ve lost her book?
| A．What about | B．How about | C．How if | D．What if |
In our school students are according to how much they know and how old they are.
| A．classified | B．combined | C．listed | D．made |
There was plenty of time. We _____.
| A．mustn’t have hurried | B． couldn’t have hurried |
| C．mustn’t hurry | D． needn’t have hurried |