1. —You like the new house, why not buy it?
    — It's really expensive.I can't a_______ it.
2. In the modern world, it's n_______ for us to learn English well.
3. The boy has tried to make his mother pay more a_______ to him.
4. Mr. Green has got his driver's l_______. He can drive a car.
5. — Do you know who d             America?
    — Columbus (哥伦布).
6. We all regard that_______ (友谊) is the most important in the world.
7. You should be _______ (有耐心的) to wait for him.
8. His idea often _______ (影响) his decisions.
9. If Lucy is given a chance, she will _______. (成功)
10. We must know the ______ (重要) of learning English.

1. The s             on the teacher's face showed that she was pleased with us.
2.  Listen!There is somebody k           at the door.
3. There are n           34 million people living here.
4. Now stop writing and listen to me c            .
5. Trees and flowers are planted every year to make our country more b           
6. Pollution is a             (严重的) problem. Scientists have come up with some good ways to solve it.
7. It is            (必要) to learn English well.
8. A lot of meetings were put off because of the             (危险的) disease.
9. I           (不知道) if the teacher will come tomorrow.
10. Ann has made great             (进步) recently.