Look! The bowl is empty. There's _______ in it.
根据题干中的“这个碗是空的”可推断，里面什么也没有，故所缺的词是nothing。故选C。
—Would you like some fish?
—______. I love to eat fish.
本题考查“Would you like...?”句式的答语。问句的含义是“你想要一些鱼吗？”，根据答语中的“我喜欢吃鱼”可知，所缺的答语是“Yes,please”，故答案为A。
—Would you like to go to the library with us?
— ________.
四个选项中，只有B项是适合本场景的答语，意为“太棒了！我想去”。故选B。