【历史上重大改革回眸】阅读材料，回答问题

材料：明制凡鞫重囚大案，必须有刑部、大理寺和都察院会审，谓之三法司会审。洪武时确定会官审录制度，令五军都督府、六部、都察院、六科、通政司、詹事府等部门的官员到场审录，以后形成制度化。另外，刑科给事中还把握了死囚的终审环节，对于已经判处死刑的罪囚，行刑前还须经刑科最终复核。在地方上，提刑按察司为省级执法机构，同时朝廷派出的各道监察御史、巡按御史等都要参与地方要案的审理。府、县由知府、知县负责审理案件，但要受到监察机关的严密监督。总之，从中央到地方一切重大要案的审判，台谏官都要参与，“凡有疑狱，必力争不已”

——摘编自白寿彝《中国通史》

从框里选择填入对话相应空白处的适当选项

A: Hello, this is Ann.Is that Helen ?
B: Yes, speaking.
A:Helen, The happy weekend is coming. ____ 
B: Yes, I’m not busy. I've already finished my homework.
A: ____ 
B: I’ve no idea. What about you ?
A: Let me see. Let's do something interesting and helpful. ____ 
B: Certainly. Where?
A: In the new museum.
B: Oh, I remember. I heard of it last week. ____ 
A: By bike. It's Saturday tomorrow. The traffic must be heavy, I think.
B: I agree. ____ 
A: At the gate of our school at nine in the morning.