It _________ these question that are difficult.
A.are
B.was
C.is
D.has

The facilities at the new research library, including an execllent microfilm file, ___________ among the best in the country.
A.are
B.is
C.has been
D.was

The letter was not mailed in time, and _________________
A.neither is the package
B.neither was the package
C.neither the package is
D.neither the package was

The staff ______________ in the conference room at the moment.
A.are meeting
B.were meeting
C.met
D.is meeting

Far too few of us _________ financial discipline
A.have
B.be
C.are
D.has

Both viruses and genes __________ made from nucleoproteins.
A.are
B.is
C.were
D.has been

Each of the reference __________ available in the school library.
A.books on that list is
B.books on that list are
C.book on that list is
D.book on that list are

Several ______________ sleeping under a tree.
A.of lions were
B.lion was
C.of the lions was
D.lions were

At the new conference, several reporters didn’t get clear answers to _________ questions.
A.theirs
B.their
C.his and hers
D.his and her

There _________ in the world today.
A.is many new computer company
B.is many new computer companies
C.are many new computers companies
D.are many new computer companies