根据句意及所给中文提示或英文解释，写出句中所缺单词。
1. Children in the west usually wear _________ (特殊的) costumes with masks at Halloween.
2. Zhang Shaohan has a sweet _________ (嗓音), and many of us like listening to her songs.
3. People around the world love _________ (和平) and hate wars.
4. As we know, _________ (星期一) is the second day of a week.
5. Sorry, I didn't follow you. Would you please speak more _________ (清楚地)?
6. Now we are short of water and we should s_________ water in our daily life.
7. Peter's father is very _________ (not free), so he does not have much time for his family.
