1. where’s an| the electric heater? i can’t film it. 2. what happened at an|the end of a|the film? 3. david has at|the appointment at a|the optician’s. 4. an/the old person sometimes feels lonely. 5. peter owns a/the largest model plane in a/the world. 6. luckily a/the fire brigade soon came and put out a/the fire. 7. harry's mother bought him a/the guitar for his birthday present, 8. i'm thinking of buying a/the new pair of trousers. 9. in the end there was a/the war between the two countries, 10. i didn't know an/the answer to a/the question, so i left it out.