Ⅰ. 根据句意及汉语提示，填入恰当的单词。
1. Sun Wukong has a (有魔力的) stick in the book Journey to the West.
2. Several (夫妻) were dancing on the dance floor.
3. A fish moves its (尾巴) to swim.
4. Mark is very friendly. He is always (微笑) to others.
5. It was (愚蠢的) of you to trust him.
