用括号中所给单词的适当形式完成下列句子
1. All the students in Shanghai should help fight to protect the environment. (pollute)
2. Now the good method is used in the experiments. (wide)
3. The old man was to the policeman who found the lost car for him. (thank)
4. For the time he became worried about the future because of the global financial crisis (金融危机). (one)
5. Mother bought a nice dress the day before yesterday, and now she is dressing . (she)
6. Qingming Festival is an important Chinese festival to remember people’s relatives. (die)
7. Professor Brown can still tell quite a few funny , although he is already in his eighties. (story)
8. Bolt in winning the gold medal in the 2008 Beijing Olympic Games.(success)