a)
1 I am going to write an opinion essay in formal style.
2 boxing, martial arts, rugby
b)
A disagrees В agrees C agrees
A Referees are always present during boxing matches to ensure that participants follow the rules and that they are fit to continue.
В Contestants win by causing physical injury to their opponents, so fans of the sport mimic their sporting heroes’ behaviour and believe that violence is acceptable.
C Head injuries are common among boxers and these could cause permanent brain damage.