—Excuse me, sir. You can’t enter ________ office without ________ permission.—But the manager is expecting me.
#7815
A
the; a
B
an; the
C
the; 不填
D
不填；不填
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When Mary saw _____ piles of plastic in the bin, _____ strong sense of responsibility made her stick to her recycling work．
#8577
A
不填；不填
B
不填; a
C
the ; a
D
the; the
Some people fear that ______ air pollution may bring about changes in ______ weather around the world.
#9306
A
/, the
B
the, /
C
an, the
D
the, a
Recently people have made great progress in using ____ power of nature to produce____ electricity.
#8387
A
a; the
B
/; /
C
the; /
D
a; an
In China, ______car is getting to be ______popular means of transport.
#9645
A
the; the
B
a; /
C
the; a
D
a; the