Most scientists agree that Aids is caused by the HIV virus. The virus attacks the body’s immune system, making the sufferer vulnerable to other diseases. It can be passed on by sexual contact, the use of shared needles for injecting drugs, and (now rarely) by blood transfusions using contaminated blood. It can also be passed on by pregnant women to their unborn children.
A person can be infected with HIV for many years with no symptoms at all, but in around 95% of cases Aids develops eventually. Since Aids sufferers have no defence against diseases in general, the symptoms can vary widely. They may include fever, weight loss, infections of the mouth and, as the disease progresses, tuberculosis or leukaemia.
Aids is a relatively recent disease, but one which has spread rapidly around the world, particularly in Africa and in large cities in many countries. Estimates of the actual numbers involved vary widely.
Avoid injecting drugs, particularly with a shared needle, and stick to one sexual partner. The use of condoms is known to reduce the risk of infection.
There is as yet no cure for Aids, which kills 99% of sufferers. Scientists have produced (and are producing) a number of drugs which slow down the progress of the disease, and there is a huge amount of research into finding out more about the disease. However, no effective vaccine has yet been developed.
1. I ______________ (not understand) what he ________________ (say).
2. ‘What ______ you _________ (do) this summer?’ ‘We ____________ (spend) a week with friends in Greece.’
3. While I ______________ (work) hard my lucky sister _____________ (enjoy).
4. After John _____________ (leave) the army, he ______________ (apply) for a job in a bank and ________________ (work) there ever since.
5. ______ you __________ (hear) the news? Simon and Sally _____________ (announce) their engagement. They ________________ (go out) together for ages but nobody _____________ (think) they would ever get married.
Situations:
1. Zapytaj o cenę pokoju dwuosobowego z łazienką w hotelu.
2. Jesteś w bibliotece. Zapytaj o interesującą cię książkę.
3. Chcesz otworzyć okno, ale nie wiesz, czy ci wypada. Poproś o pozwolenie.
4. Podaj rozmówcy, kiedy najczęściej można cię zastać w domu.
1. I _________________ (give) you a ring if I ________________ (need) any advice.
2. He gave ____ his job because he was fed up _______ such long hours.
3. I would never use your telephone ___________ your permission first.
4. Chris _______________ (not take) a day off work unless he ______________ (be) really ill.
5. When the police _____________ (arrive), the thieves ______ already ______ (leave) the building.
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