Ответы на вопрос:
1)Thd pipettes were already washed.
2) The theme of research was offered by his supervisor.
3)The easiest way to do it was showed.
4)The pH constant is kept by buffer.
5)This research wasn't done by Boris before his assistant helped him.
6)These engines was started by hand in the 1 century. Now they started by electricity.
7)The new research center was opened by the Primary.
Объяснение:
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