---Which is ________ , the sun, the moon or the earth?----Of course, the moon is.
A. small
B. smaller
C. smallest
D. the smallest
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The air in Beijing is getting much_______ now than a few years ago.
A. clean
B. cleaner
C. cleanest
D. the cleanest
Mobil phones are very popular now and they are ____ than before.
A. cheap
B. cheaper
C. cheapest
D. the cheapest
Which is ____, ia bicycle or a computer?
A. expensive
B. more expensie
C. the most expensive
D. the more expensive
The Yellow River is one of ____ rivers in China.
A. long
B. longer
C. the longest
D. the longer