1. 从方框内选择合适的词或短语并用其正确形式填空。

building, pollution, predict, fall, alone, help with, astronaut, seem, keep, come true

1. （1） Be careful on the ice, or you will .

3. （2） Do you think that Chinese will fly to Mars one day?

5. （3） Her dream to be a movie star after she played a role in a movie.

7. （4） My sister and I have the same about the future.

9. （5） We are sad about the of the beaches with oil.

11. （6） Julia asked me to her homework. She couldn't do it by herself.

13. （7） In Canada, many people dogs, cats and other animals as their pets.

15. （8） In big cities, there are many tall on both sides of the street.