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1. (To make) the discovery of filterable viruses, Dmitry Ivanovsky determined the cause of the tobacco mosaic disease. 2. The book "The Anatomy of Cardiac Blood Vessels" (to compose) by S. Samoylova after her numerous investigations was published in 1970. 3. On having performed the operation, the surgeon must carry out all the procedures (to prevent) from the infection. 4. (To relieve) of all the painful symptoms, the male patient fell asleep.

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