Разделите глаголы на 2 группы: действительный залог и страдательный залог (Active и Passive):

Students receive..., they are discussed..., the scientist has been making..., the experiment has been finished..., the lecture took place..., the substance was replaced..., the labotatory will be equipped..., the engineers will solve..., chemists fulfilled... .

1) Active:
students receive
they are discussed
the scientist has been making
the engineers will solved
chemists fulfilled
the lecture took place
2) Passive:
the experiment has been finished
the substance was replaced
the laboratory will be equipped

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