Ответы на вопрос:
1.aids is caused by the human immunodeficiency virus. 2.it is a very dangerous disease which can bring a lot of problems. 3.the number of people who have this disease is increasing all the time. 4.it is a virus that spreads by blood. 5.people have to be aware about the disease,and to take care. 6.a blood test can show if a person has aids. 7.there is no treatment from this disease.
Глагол have/has и причастие прошедшего времени от смыслового глагола. i have got a toy. she has done her homework. they haven't been to turkey. have you seen the plane?
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