根据句意，用适当的单词填空。

1. _________my grandpa is over eighty years old, he is very good in health.

2. My cousin has a bad toothache. He is going to see the_________ this Sunday.

3. I'm busy now.  Maybe we can go to the movies _________ time.

4. Sunday is the _________ day of the week.

5. —Can you come to my party tonight?

    —_________, I'd love to.

基数效用理论在推导消费者需求曲线时，是以边际效用递减规律和（）为基础。

A、消费者对的商品的偏好

B、消费者效用最大化均衡条件

C、消费者对商品价值的识别

D、消费者对商品价格的支付能力