根据句意及汉语提示完成句子

1. There is but one______(步骤)from the right to the wrong.

2. Do you want to be a_______(英雄)in the future?

3. Passengers, attention  please!_______(航班)No. CA149 will take off,please go to Gate 8.

4. All pilots are_______(负责的)for their passengers' safety.