distractors: why how when
sentence: As we were   checking  out,
  the cashier praised me for my necklace.I thanked her, and she asked   [MASK]  .I bought it.I had gotten it at the department store just down the street, and told her that it was on sale for 40%   off  .My friend suggested that she should walk over and purchase one during her    break  .But the cashier said she couldn't   afford  it
  right now.