3.
a)The most job, done by man, is the job of logger.
b) The most job, done by woman, is the dental hygienists job.
4.
1) actress, actor
2) senior master, head master
3) nurse, nurse
4) air host, air hostess
5) policeman, policeman
6) fireman, fireman
7) pilot, pilot
Все что смог, остальные не понял.