I was so sleepy that I could hardly keep my eyes ______ yesterday evening.
A. opening
B. open
C. to be opened
D. to open
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There are many young trees on _______sides of the road.
A. every
B. each
C. both
D. all
-- It's so cold today.--Yes, it's____than it was yesterday.
A. more cold
B. more colder
C. much colder
D. cold
Little Tom has ________ friends, so he often plays alone.
A. more
B. a little
C. many
D. few
She isn't so ______ at maths as you are.
A. well
B. good
C. better
D. best