根据句意，用所给单词的适当形式填空。

1. What should we do to help the ______ (home) people after the earthquake?

2. We do lots of outdoor ______ (active) when spring comes.

3. By the time I got outside, the school bus ______ (leave).

4. Tim was seen ______ (get) out of the subway at the station on Centre Street.

5. I've bought a present for my father's ______ (forty) birthday.