Viết lại câu nha 15. She started working as a secretary five years ago. >She has... 16. Because of his broken leg, he didn't take part in the contest yesterday. > Because his... 17. Despite the bad weather, we went out for a picnic > Although 18. Scientists have discovered that there is water on Mars > It has been 19. I spend three hours doing my homework every day. > It takes

15. She has been working as a secretary for five years.

16. Because his leg  was broken, he didn't take part in the contest yesterday.

17. Although the weather is bad, Nam went out for a picnic.

18. It has been discovered that there is water on Mars by scientists.

19. It takes me three hours to do my homework every day.

15. She has worked as a secretary five years ago.

16. Because his leg was broken so he didn't take part in the contest yesterday.

17. Although the weather is bad, we went out for a picnic.

18. It has been discovered that there is water on Mars

19. It takes three hours to do my homework everyday.