Заполните пропуски глаголом "to have" или "to be" в соответствующем времени. 1. A contaminated ob

Заполните пропуски глаголом "to have" или "to be" в соответствующем времени. 1. A contaminated object ... one that contains bacteria. 2. Bacteria ... found in various parts the body. 3. The presence of bacteria does not mean necessarily that a disease process ... been established. 4. A strain that ... reduced virulence is said to be attenuated. 5. Man and animals ... several defense mechanisms for destroying invading bacteria.