1 Making a living as a door-to-door salesman demands a thick skin,both to protect against the weather and against having the door shut in your face.2 I have a very clear mental picture of what happened to me when i took my first examination in primary school.3 After having a taste of life in a big city,Mary returned to her quiet life in the country.4 She never tries anything new because she's afraid of failure.5 He offered a challenge to anybody to come and beat him at chess.6 The kid was so smart that he finished a 500-piece puzzle within half an hour.7 I thought her request for more information was reasonable,but it was rejected.8 Don't eat so much chocolate,otherwise you'll be sick.9 It's not realistic to expect my parents to lend us any more money.10 The goal is to raise the cultural and technical level of workers to that of technicians.