This washing machine is environmentally friendly because it uses _____ water and electricity than _____ models.
A. less; older
B. less; elder
C. fewer; older
D. fewer; elder
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This ruler is too short. I need a _____ one.
A. long
B. longer
C. more long
D. more longer
Of the two sisters, Betty is _____ one, and she is also the one who loves to be quiet.
A. a younger
B. a youngest
C. the younger
D. the youngest
-Oh, how fat he is! -But I think he is _____ than fat.
A. short
B. shorter
C. more short
D. shortest
-Do you think him naughty enough?-I’m afraid he’s _____ than naughty.
A. more clever
B. clever
C. much clever
D. much more clever