9. Joining in extracurricular activities can broaden our circle of acquaintances.
参加课外活动能扩大我们的社交圈。
还能这样说：
From extracurricular activities we can make many new friends.
Extracurricular activities are very good for us to broaden our circle of acquaintance.
谚语：
It's as broad as it is long.
半斤八两。
10. We should join in more activities after school.
我们应该多参加课外活动。
还能这样说：
We should take an active part in the extracurricular activities.
We ought to participate in after-class activities.
谚语：
After a storm comes a calm.
雨过天晴，苦尽甘来。
11. Who are we going to play today?
我们今天和哪个队对打？
还能这样说：
Which team will we play with?
Who will we play today?
应用解析：
a play on words pun 双关语；
come into play 起作用；
play on 利用
12. What's your favorite sport?
你最喜欢什么活动？
还能这样说：
Which sports do you like best?
What pleases you best?
应用解析：
make sport of sb. 嘲笑某人，开某人的玩笑；
be a sport 够朋友一点，讲点交情；
good sport 堂堂正正的好人；讨人喜欢的人
13. I joined students society.
我加入了学生社团。
还能这样说：
I am on stuents club.
I am a member of students society.
应用解析：
move in polite society 出入上流社会；
avoid the society of 避免和……来往；
be quit of sb.'s society 和……断绝来往；
go into soceity 进入交际界，常赴宴会
14. What extracurricular activities did you usually have at your university?
你在大学通常参加什么课外活动？
还能这样说：
What were your extracurricular activities when you were at college?
What activities did you usually take part in your spare time?
15. I worked my way after class.
我在课外勤工俭学。
还能这样说：
I was on work-study in my spare time.
I paid my way through my college after class.
应用解析：
be way beyond expectation 大大出手意料外外；
across the way 路对面；街对面；
bluff one's way out (of) 蒙混过关
16. The extracurricular activity is a necessary part of the school lives.
课外活动是学校生活不可缺少的一环。
还能这样说：
It is highly necessary to join extracurricular activity in school.
Extracurricular activity is an absolute essential in shcool lives.
谚语：
Make yourself necessary to someone.
使自己成为别人需要的人。
17. I like taking part in extracurricular activity very much.
我非常喜欢参加课外活动。
还能这样说：
I am keen on extracurricular activity.
I like extracurricular activity quite a lot.
应用解析：
take sb.'s fancy 占有某人的心；
take (the) first place 居首位，得第一；
take sb. at a disadvantage 乘人不备；乘人之危；
be taken ill 患病