It is imperative ____ what to do when there is a fire.

A. he must know about

B. that everyone know

C. we knew

D. that he knew

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in theposidon ofprim mystress in each of the following questions.

A. biology

B. ignorance

C. national

D. educate