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a child-minder
someone who looks after children in her/his house during the day while the children's parents are working

a canvasser
someone who goes to people's houses and tries to persuade them to vote for a particular politician or political party in an election (canvassers are usually volunteers, they don't get paid for this work)

a spin doctor
someone who makes ideas, events and political speeches seem better than they really are

a speech writer
someone who writes speeches for a politician

an agony aunt
someone who answers people's emotional, work or family problems

a gossip columnist
someone who writes about what famous people are doing, what parties they go to and who's dating who

a traffic warden
someone who enforces parking rules and gives out tickets to drivers who park their cars illegally

a bicycle courier
someone who delivers letters and parcels within a city (usually in the business district) by bike

a whiz at something
someone who is very good or fast at a particular activity or task

a pager
a small machine which receives signals from a telephone

right away
immediately

a favour
something you do for someone to help them out