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18. It is ______ that he has passed the examination, and I am _____ I will pass it too.

A. certain; certain                           B. certain; sure      

C. sure; certainly                            D. certainly; surely

18. It is ______ that he has passed the examination, and I am _____ I will pass it too.

A. certain; certain                           B. certain; sure      

C. sure; certainly                            D. certainly; surely

18. It is ______ that he has passed the examination, and I am _____ I will pass it too.

A. certain; certain                           B. certain; sure      

C. sure; certainly                            D. certainly; surely

18. It is ______ that he has passed the examination, and I am _____ I will pass it too.

A. certain; certain                           B. certain; sure      

C. sure; certainly                            D. certainly; surely

18. It is ______ that he has passed the examination, and I am _____ I will pass it too.

A. certain; certain                           B. certain; sure      

C. sure; certainly                            D. certainly; surely