A.publication
B.waste
C.contribution
D.certainly
E.yield
F.multiply
G.critical
H.passion
I.concerning
J.available
K.liable
L.sustainable
K.responsible
N.including
O.especially

A．Stand in the queue.
B．Wait for a free computer.
C．Ask his tutor to recommend him some books.
D．Use the computer to find the needed information.