According to the passage, the primary source of the plant fiber used in paper is
A.rags
B.trees
C.fabric
D.wastepaper

__________(2)
A.book
B.has booked
C.will book
D.booked

__________(5)
A.was not
B.am not
C.haven't been
D.won't be

__________(6)
A.made
B.make
C.was made
D.have made

__________(8)
A.asked
B.was asked
C.have been asked
D.will ask

__________(9)
A.was
B.were
C.have been
D.will be

__________(10)
A.had
B.have
C.have had
D.had had

She was very conscious ................................her lack of experience on her first day at work.
A.of
B.from
C.at
D.in

Nobody helped him. He managed it ................................his own.
A.off
B.among
C.under
D.on

The summer holiday is coming. We are all excited ................ going ............ a long trip ...........the South.
A.with - to - on
B.about – on - to
C.about - in - to
D.about - at - to