根据句意及首字母或汉语提示完成单词。
1. He wants to go back to a mountain v______ to teach the children after leaving the college.
2. The old man is p______ but happy because he has many friends.
3. The air is t______ in high mountains.
4. The woman was very sad because her ______ (丈夫) died in the accident.
5. He ______ (返回) to the hotel after he finished having the meeting.