请认真阅读下面对话，并根据各题所给首字母的提示，在答题卡上标有题号的横线上，写出一个英语单词的完整、正确形式，使对话通顺。
W: Hi, Mark, haven’t seen you for a___76____. How are you doing?
M: I’m busy with my e___77_____ in the lab, but after work I often play some s___78____.
W: Like what?
M: Like t____79____, running, and golf.
W: Golf? That’s my f____ 80_____. How often do you play it?
M: I u____81____ play it about once a month. What about you?
