9. Boxing is a dangerous sport.
拳击是一项危险运动。
还能这样说：
It's a dangerous sport to do boxing.
It's dangerous to do boxing.
应用解析：
be in danger of 有……的危险；
in danger 在危险中；
make danger of 对……有点担心；
out of danger 脱离危险；
run the danger of 冒……的危险
10. She's got a brown belt in judo.
她已是柔道棕带。
还能这样说：
It's said that she has got a brown belt in judo.
She has been a brown belt in judo.
应用解析：
hit below the belt 暗中伤人；不择手段；
hold the belt 夺得锦标；
lay under one's belt 大口地吃，拼命吃；
tighten one's belt 节省；饿肚子；
belt out 热情演奏
11. Hitting with fists and kicking with feet are allowed in taekwondo.
跆拳道允许用拳击和用脚踢。
还能这样说：
In taekwondo, hands and feet can be used to attack the opponent.
It is allowed to use fists and feet in taekwondo.
应用解析：
have no kick left in 没劲了；
for kicks 为了寻欢作乐；
get a kick out of sth. 从某事得到乐趣；
give a kick at 对……踢一脚
12. I intend to participate in a kungfu tournament on behalf of my school.
我打算代表我们学校参加一个功夫联赛。
还能这样说：
I make up my mind to represent my school to take part in a kungfu tournament.
I decide to attend a kungfu tournament as a representative of my school.
应用解析：
intend sth. for sb. 为某人准备某物，使某人受某物影响；
represent sth. as sth. 打算使某事物成为另一事物；
represent sth. by sth. 欲使某事物具有某意义，意指