Ex. 7. Find the sentences in which the form with the suffix "~ed" is a part of the passive construction:
1. They produced many new goods at our plant.
2. This new material was produced at our plant.
3. He carried out his first experiment at the age of 18.
4. Great research work is being carried out by our students.
5. D.I. Mendeleyev formulated the Periodic Law.
6. This law opened a new era in chemistry.
7. The articles were translated by our students.
8. He was appointed professor of the physico-chemical department.
9. All the samples will be carefully examined.
10.The work was presented in time..

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