Librarians spend a lot of time ..............books (class)
A.classical
B.classifying
C.classmate
D.classic

Don’t let a good chance go ...............
A.on
B.off
C.by
D.over

Stop now! You've done ..............work for one day
A.too many
B.plenty
C.quite more
D.quite enough

He seldom goes fishing........................?
A.doesn’t he
B.is he
C.does he
D.isn't he

Not one of the students ...............the answer to that difficult problem
A.know
B.knows
C.is knowing
D.has known

We will wait until he shows up
A.appears
B.answers
C.speaks
D.finishes

______(2)
A.between
B.of
C.among
D.Both A and B

______(4)
A.his
B.the
C.Both A and B
D.them

______(5)
A.course
B.term
C.final
D.examination

Which of the following can best replace “in flux” ?
A.breaking
B.producing
C.changing
D.increasing