279.
M: I'd like to pay a visit to the Smiths at 3:30 p.m. Will you go with me, Mary?
W: I'd love to, but I won't be off work from my factory until 4:00 p.m. How about 4:15? I'll be free then, Jack.
M: OK. Let's meet at the bus stop and take the No.5 bus to go there.
W: Why not by bike? The bus would be crowded at that time.
M: But my bike is broken.
W: You can use your sister's new bike, can't you?
M: Yes. I'll wait for you in front of the bookstore opposite the cinema.

答案解析：
(1) 正确答案为C。根据How about 4:15? I'll be free then, Jack.4：15怎么样，我那时就有空了，杰克。可知，二人定于4点一刻去拜访史密斯一家，因此C项正确。
(2) 正确答案为B。根据Why not by bike? 为什么不骑车去呢？以及后面女子建议男子骑他姐姐的新自行车去，男子同意，可知，二人将骑车去，因此B项正确。
(3) 正确答案为C。根据I'll wait for you in front of the bookstore opposite the cinema.我在电影院对面的书店前面等你。可知，二人将在书店前面碰面，因此C项正确。