Etiket - toefl kursları ankara ümit köy


  HIV is rarely seen as one of science's success stories. Nearly 20 years after the virus (1)----, an estimated 42 million people are infected worldwide. (2) ----, there is still no vaccine and no cure. HIV is one of the most (3) ---- and deadly viruses humans have (4) ---- encountered. There are, however, some (5) ---- for cautious optimism as real progress is being made in some key areas.was discoveredwill be discoveredwas being discoveredis discoveredwould be discoveredHIV is rarely [...]

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