distractors: eagerly unfortunately hopefully
sentence: Once upon a time,a well-known painter was finishing his painting.It's an incredibly beautiful painting to be  shown  during Princess Diana's marriage*
  The painter was consumed by and excited with his own painting that he  [MASK]  took a few step
  backward while  admiring  the 2x8 m2 painting.He didn't look back when he walked backward.He kept on walking backward  until  it
  was simply a step away from the edge of the  tall  building.Just one more step backward and he could get himself  killed  .