许多医生认为拳击太危险，应该被禁止。

Many doctors believe that ___boxing is too dangerous and should be banned.

他是一位前世界重量级拳击冠军。

He's a former world heavyweight ___boxing champion.

你可以做健身、拳击、壁球和网球。

You can do gym, ___boxing, squash, and tennis.