About seventy percent of the surface of our planet ( ) covered by water.
A. are
B. is
C. were
D. was
It is fun ( ) with our friends.
A. to have Christmas parties
B. having Christmas parties
C. have Christmas parties
D. to having Christmas parties
Father is ( ) of the five sons of his parents.
A. oldest
B. eldest
C. the oldest
D. the eldest
He doesn’t play basketball as ( )as his brother.
A. good
B. well
C. better
D. best
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