211.
M: Hi, Ann. I hear you've started evening discussions on popular music. How is it going?
W: Pretty well. I must say I've learned a lot. But it would be nicer to have someone who knows more about the subject. Could you possibly join us?
M: Certainly. When do you usually meet?
W: We meet twice a week-Tuesday and Saturday. Is the time convenient for you?
M: Tuesday is OK. But I don't think I can come on Saturday.
W: What about Friday evenings? We hope to see you present.
M: OK. I'm free on Friday evenings.

答案解析：
(1) 正確答案為C。根據But it would be nicer to have someone who knows more about the subject. Could you possibly join us?但是如果有更了解這個主題的人加入就更好了。你能加入我們嗎？可知，女子邀請男子加入討論是因為男子很了解流行音樂，因此C項正確。
(2) 正確答案為B。根據Tuesday is OK. I'm free on Friday evenings. 周二沒問題。我周五晚上有時間。可知，討論時間定為每周二和周五，因此B項正確。