1. visit the Great Wall = pay/have a visit to the Great Wall 2. A policeman catches thieves and helps keep the city safe. 3. An engineer works in a company and designs machines. 4. A secretary types letters and answers the phone.
5. A farmer grows vegetables in fields. 6. An architect draws plans of buildings. 7. How long has he been a cook? 8. He has been a cook for quite a few years. 9. The Li family has moved into a new flat. The Lis have moved into a new flat. 10. The Li family/The Lis are watching TV.