Нужно вставить for, since или ago! 8. our family haven't heard from five months 9. oh, john! as usual you are late. i've waited for 11 a m 10. he has worked for this april. 11. i haven't spoken to mary . 12. two years bought a car. 13. mr. pembroke doesn't often mow the lawn he hasn't cut the grass . l 4. i have never sailed that journey 15. we have been waiting here an hour

8. our family haven't heard from him for five months 9. oh, john! as usual you are late. i've waited for you since 11 a m. 10. he has worked for this company since april. 11. i haven't spoken to mary  since christmas. 12. two years  ago derry bought a car. 13. mr. pembroke doesn't often mow the lawn. he hasn't cut the grass  for ages. 14. i have never sailed again since that journey 15. we have been waiting here now for an hour.

there are both advantages and disadvantages in being a doctor. first of all, profession of a doctor is the one where you do not have weekends and holidays, where you have to work at nights and change your plans because of an emergency call. another disadvantage is that sometimes you have to deal with fatal illnesses which can be very stressful.

however, advantages of this profession surpass its disadvantages. everyone treats doctors with great respect. there are no limits for improvement in this profession and where there is a will, there is a way. and the last, but not the least is joy and gratitude of a recovered patient.

the role of medicine has greatly increased, especially now when people are trying to look after their health. they undergo medical examinations on a regular basis and do not neglect any indisposition.

with the development of modern technologies new methods of treatment become available. and all that means that profession of a doctor will remain in high demand for many years to come.