What can you do to reduce your impact

There are a lot of different professions in the world.  As for me, I would like to become a doctor.  It seems to me that it’s my vocation. I like to help people. I know that if you want to become a doctor you must be good at studies because a doctor is one of the most responsible professions. People trust doctors the main treasure they have – their life, that’s why  doctors must be highly qualified specialists. They must help people at any time and doctors can’t make  mistakes. Qualified specialist always diagnoses and institutes therapy correctly. Human life often depends on professionalism of a doctor. They must be openhearted people. They must worry about the health of their patients.  My grandmother is a doctor. She is proud of her profession and likes it. I consider this profession to be the best one for me too. So after finishing school I am going to enter the medical academy/university.
To conclude, choosing a profession is one of the most important decisions one has to make. We spend at work a lot of hours in our life that is why it has to bring us happiness and satisfaction and you should think well before jumping up to the final decision. I am sure my choice is correct.

1) Does he enjoy swimming, windsurfing, and diving?
What does he enjoy to do?
Who enjoys swimming, windsurfing, and diving?
He enjoys swimming, windsurfing, and diving, doesn't he?
Does he enjoy swimming, windsurfing and diving or reading?

2) Were millions of brightly coloured fish moving busily around him?
How many brightly coloured fish were moving busily around him?
Where were millions of brightly coloured fish moving busily?
Millions of brightly coloured fish were moving busily around him, weren't they?
Were millions or hundreds of brightly coloured fish moving busily around him?