40 人不在家它閉嘴, 人不在家它閉嘴 人回來時它張嘴。 人回來時它張嘴 猜房屋的一樣東 西 猜房屋的一樣東西 Guess what? When people are away, It closes its mouth; When people come back, It opens up wide. ( Something found in a room ) 51