Откройте скобки, используя инфинитив в соответствующей форме времени и залога.
1. Exacerbation of duodenal ulcers is known (to occur) in spring and autumn.
2. The doctor seems (to finish) his examination.
3. The operation was thought (to be) successful.
4. The used methods were thought (to stop) the spread of infection.
5. This drug is considered (to be) very effective.
6. She is known (to have) a heart disease since childhood.
7. A careful history is known (to lead) to a correct diagnosis.
8. The patient was stated (to have) an open dislocation of the left knee.