16. Margaret has flown to San Francisco and Los Angeles in the last two months.
17. Carolina studied Biology at the University and began to work at a famous laboratory two years ago.
18. Martin has taken the dogs for a walk in the park.
19. We had an early breakfast but we didn't have any lunch yesterday.
20. The postman brought me some letters this afternoon.
21. My mum finished work at 3.30.
22. Alexander has spoken to his parents about his career.
