Ⅰ. 根据句意及首字母或汉语提示完成单词（10分）
1. “Practice makes p______ . ”is a famous proverb.
2. He met a serious problem. He had no c______ but to solve it.
3. Everyone is equal before the ______（法律）.
4. It is our ______（责任）to save water.
5. If you want to be ______（获得成功）, you have to know what you truly want.
