根据对话内容，补全对话中所缺的单词、短语或句子。请将答案写在题后相对应的横线上。

A: Bill, I've been asked to dinner tonight. What time should I arrive for that? 　　

B: Did they tell you 1              ? 　　

A: Yes, they said the dinner would begin at seven. 　　

B: Then 2               before 7:00. But make sure you are not much earlier than the time. 　　

A: Why? 　　

B: That's just what it is here. Maybe they are still 3               the dinner. 　　

A: 4              ? 　　

B: For the first time, you can bring a small present. You don't want to show to everyone

    5               rich you are, do you? 　　

A: No, 6               . Thank you for your help. 　　

B: That's all right. 7                at the party.

在人寿保险定价假设中，利率假设的实质是

A．保户未来的一种收益

B．保户现在的一种收益

C．保户过去的一种收益

D．保户未来的一种支出