Read the passage and answer the questions. One afternoon in August, the weather was warm, and a group of children were working very hard to catch those colorful butterflies.

1. The thrush that was captured by "I" and locked in a cage died. The fundamental reason was that "I" made it lose its freedom; I captured some wild animals and put them in the cage.

2. Let it sing for me alone. This approach is selfish, damaging to the birds and damaging to the balance of nature.

3. Because he understood: every living thing has the pursuit of free life, and this pursuit is worthy of recognition.

4. "Omitted".

(As long as the meaning is correct)