单项选择题

What will be the population of our country by the end of（）

A.twentyone century
B.the twentyone century
C.the twentyfirst century
D.twentyfirst century

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单项选择题

A.is
B.are
C.have
D.has

单项选择题

A.Either will do
B.Yes, I like meat
C.Yes, I like fish
D.No, they are not my favorite

单项选择题

A.satisfactory
B.satisfied
C.satisfaction
D.satisfy