سلام جواب بدین تاج میزارم

سلام. 61- topic sentence: Swimming is one of the popular sport in the world. 62- concluding sentence: you need to learn how to swim and stay fit. 63- D. 64- Doctors. 65- are those who make the sick people healthy again. 66- Therefore, doctors work so hard to cure sick people and we must know their values. 67- Wind is one of the sources of energy for human. It is a renewable form of energy which can't pollute the earth. Scientist can use it to generate electricity and fulfill human needs. Thus,we can use this source of energy to generate electricity without destroying the nature.