根据上下文和你的实际情况把下面的对话补充完整。

Tom: Hi, Betty! Did you go out last weekend?

Betty: No. I stayed at home.

Tom: 小题1: _____________________?

Betty: Because I had lots of things to do.

Tom: 小题2: ___________________?

Betty: I cleaned my room and did my homework. How about you?

Tom: I went on the school trip.

Betty: 小题3: ___________________?

Tom: The Science Museum.

Betty: 小题4:______________?

Tom: Of course, we had a good time. We saw a wonderful science show there. And I want to see it again. Would you like to go with me next Sunday?

Betty: Yes, 小题5: ______________.

关系R和S如下表所示，关系代数表达式Π1，4(R∞(下标)R.C＜S.B S)的结果为 (201) ，与该表达式等价的SQL语句为 (202) 。
R关系S关系

A．{(1，2)、(2，1)、(3，4)、(4，6)} B．{(1，1)、(2，6)、(3，2)、(4，3)}
C．{(1，6)、(1，4)、(2，6)、(3，6)} D．1(2，1)、(4，6)、(3，4)、(8，3)}

A B C A B E
1 2 3 2 1 4
2 1 4 4 6 7
3 4 5 3 4 11
4 6 7 8 3 12