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()information it is! Just put it into the computer.

A. How useful an
B. What useful
C. How useful
D. What a useful

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I think he hardly makes spelling mistakes, ()

A. does he
B. doesn't he
C. do I
D. don't I

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______ are nine.

A. Three threes
B. Three and three
C. Three three
D. Three and threes

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