用所给单词的适当形式填空。

1. My life has         (change)a lot in the past few years.

2. My    (big) problem is that I can't speak English.

3. She couldn't find her son9 so she was very       (worry).

4.I used to        (get) up late.

5. If it       (not rain) tomorrow, we'11 go on a picnic.

老空是指采空区、老窑和已经报废井巷的总称。