答案:The large clock makes Baby Monkey sleep at nine o'clock.
题目翻译:谁让小猴子在九点钟睡觉?
根据第三段第2-6行:
It is nine o'clock. Baby Monkey is still playing with his toys. Suddenly, the clock throws Baby Monkey onto the bed. From then on, Baby Monkey goes to bed early.
现在是9点钟。小猴子还在玩他的玩具。突然,钟把小猴子扔到床上。从那以后,小猴子就早早地睡觉了。
故答案为:The large clock makes Baby Monkey sleep at nine o'clock.