根据句意和首字母写出相应的单词。
1. Our teacher always e_______ us to work hard at English and do more for people in the future.
2. S_______, when he went into the dark hole for the first time alone, he didn't come up any more.
3. If you go out in summer, you'd better wear sunglasses to p_______ your eyes from strong sunlight.
4. Giant pandas are in danger now, they are e_______ animals.
5. Every year a lot of t_______ come to visit the Palace Museum to see those things used in the past.
