Разделите глаголы на 2 группы: действительный залог и страдательный залог (active и passive): students they are the scientist has been the experiment has been the lecture took the substance was the labotatory will be the engineers will chemists .

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

ACTIVE
students receive,the scientist has been making,the lecture took place,the engineers will solve,chemists fiulfilled.
PASSIVE
they are discussed,the experiment has been finished,the substance was replaced.the laboratory will be equipped.