Riddle: Find the answer and explain it in detail.

1. Good idea (Lan Caihe is a man, but he always appears as a woman. It is better to be half-male and half-female. The key is the key, and the mouse is the son).

2. Balance (pedestrians file in-add a fish and a person in the middle of the team)

3. Cold dew (the leaves are deep when opening the door-the autumn wind sweeps the leaves and the cold is already exposed)

4. Hu Touwen (Wuyin Year is the Year of the Tiger, and the preface is the first article)

Tofu (Tofu is made of molds. The mold is made in Tian Zige).