Modals Verb and Nouns

The number of ________ in this factory _________ limited to 500.
employee / is
employees / are
employees / is
employee / are

The Chief Executive Officer and owner of this firm ______ my acquaintance.
is
are
have
am

The Chief Financial Officer and the chairman of this company ______ in the conference room now.
are
were
was
is

The packaging, as well as the concept of the product, _________ on your desk by tomorrow.
is going to be
were going to be
are going to be
was going to be

Each of the _______ __________ 2 hours.
course / take
course / takes
courses / take
courses / takes