Преобразуйте предложения, поставив глагол в страдательный залог:

Образец: The students listened to the lecture with great attention → The lecture was listened to (by the students) with great attention.

1. They carry out different experiments in the chemical laboratory. 2. After each lesson we ventilated our classes. 3. The students place laboratory vessels on the tables. 4. In a year we shall equip our chemical laboratory with modern apparatuses. 5. Fahrenheit introduced a new scale into the experimental work in the seventeenth centure. 6. Laboratory workers obtain large amounts of distilled water by distillation. 7. After the experiment was over we recorded all the findings.