1)
Then he attended the University of Cambridge and graduated from it in 1854. (нет глаголов to be, to have)
2) At that time students could not even have
(основной глагол, часть сказуемого в Past Simple, множ. число) such subjects
as electricity or magnetism as there was (основной глагол в Past Simple, ед. число) no laboratory for the study of
these subjects.
3) His most outstanding investigations, however,
are (основной глагол в Present Simple, множ. число) in the
field of the kinetic theory of gases and electricity.
4) It is (основной глагол в Present Simple, ед. число) in every object large or small; but
large objects, such as earth, have (основной глагол в Present Simple, множ. число) a stronger pull than small ones.
5) Although the bigger object has (основной
глагол в Present Simple, ед. число) the stronger attraction, all objects, in
fact, have (основной глагол в Present
Simple, мн. число) some
attraction too but we do not notice the gravitational pull of a book because
the pull of the earth is (основной глагол в
Present Simple, ед. число) very much
greater.
6) It was said (вспомогательный глагол в Past
Simple, ед.
число) that gravitation was (основной глагол в Past Simple, ед. число) the force which held all the atoms of a star
together.