**b) Use the words from Ex. 3a to complete the sentences.1 Doctors need to be calm in an emergency.2 Artists need to be becausethey have to think of new ideas.3 Cashiers need to be tocustomers.4 Firefighters need to bebecause they have got a dangerous job.5 Teachers need to be... becausethey have to explain things to theirstudents.6 Aerobics teachers need to bebecause they do exercise every day.​

b) Use the words from Ex. 3a to complete the sentences.
1 Doctors need to be calm in an emergency.
2 Artists need to be creative because they have to think of new ideas.
3 Cashiers need to be polite to customers.
4 Firefighters need to be brave because they have got a dangerous job.
5 Teachers need to be patient because they have to explain things to their students.
6 Aerobics teachers need to be fit because they do exercise every day.