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1. They carry out different experiments in the chemical laboratory
2. After each lesson we ventilated our classes
3.The students place laboratory vessels in 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 century
6. Laboratory workers obtain large amounts of distilled water by distillation
7. After the experiment was over we recorded all the findings

1. They carry out different experiments in the chemical laboratoryDifferent experiments  are carried out in the chemical laboratory by them2. After each lesson we ventilated our classesOur classes were ventilated after each lesson by us 3.The students place laboratory vessels in the tables Laboratory vessels are placed  in the tables by the students 4. In a year we shall equip our chemical laboratory with modern apparatusesOur chemical laboratory  will be equiped with modern apparatures in  a year by us 5. Fahrenheit introduced a new scale into the experimental work in the seventeenth centuryA  new scale was introduced into the experimental work in the seventeenth century by Fahrenheit6. Laboratory workers obtain large amounts of distilled water by distillationLarge amounts of distilled water by distillation  were obtained by Laboratory workers7. After the experiment was over we recorded all the findingsAll the findings was recorded by us After the experiment was over.