---How often are the Olympic Games held？ ---_____four years.
| A．Every | B．Each | C．In | D．For |
The old lady _________along the road when the car hit her suddenly.
| A．was walking | B．walked |
| C．had walked | D．has walked |
The President __________China in the near future.
| A．visit | B．visited |
| C．have visited | D．will visit |
You should go to bed early, ____________you will feel tired in the morning.
| A．or | B．but | C．and | D．so |
Must we hand in the exercise book now?
No, you______, you can hand in it tomorrow.
| A．mustn’t | B．needn’t |
| C．can’t | D．shouldn’t |
This kind of car is _______ than that one because it uses less fuel.
| A．popular | B．more popular |
| C．most popular | D．the most popular |