根据下列句子所给的汉语注释及句意，写出句子空缺处各单词的正确形式。

1. Her mother has just had her _________ birthday. (四十)

2. Can you tell me where buses are _________ (生产)?

3. Is he ________ (激动) about going to America.

4. Our teacher often _________ (讨论) problems with us in English.

5. This tree is the _________ (最高) of the three.

6. Two years ago Kate _________ (更喜欢) oranges to apples.

7. There are many _________ (不同) between her and her mother.

8. His grandfather has been ________ (死) for five years.

9. We are sure that China can hold the Olympics in 2008 ________ (成功).

10. ________ (跑步) is good for your health. Please don't give up.