Many facts proved that long before Columbus ________ America, Chinese had visited it.
| A．noticed | B．uncovered | C．discovered | D．arrived |
4. The huge picture looks more beautiful _____ the blue sky.
| A．against | B．to | C．over | D．Under |
3. I'll leave Beijing for Guangzhou ____ a week, while my brother will leave Guangzhou for Beijing ____ our National Day.
| A．in, in | B．after, in | C．after, after | D．in, after |
2. Another grand bridge will be built _____ the Pearl River in our city.
| A．along | B．up | C．on | D．Across |
1. He kept his head _____ water when he began to learn swimming, but he raised his head now and then
| A．over | B．below | C．above | D．Up |
100. The visitors _______ the castle are asked not to take photographs.
| A．of | B．to | C．in | D．into |