句型转换。

1. Wang Xiao didn't go to school. She had a fever. (合并为一个复合句)

    Wang Xiao didn't go to school _____ she had a fever .

2. If you don't study hard, you won't pass the exam. (改为同义句)

   You won't pass the exam _____ you study hard.

3. I am 15. My brother is 13. (合并为一个复合句)

    I am two years older _____ my brother.

4. It's raining heavily, but I still go to school. (改为同义句)

    I still go to school _____ it's raining heavily.

5. It is three years since I joined the army. (改为完成时态)

    I have _____ the army for three years.