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
B