Michelle found a job as a high school teacher which ________ spending quite a lot of time with students. 

 —How did it _____ that you made such a silly mistake?—I myself haven’t figured it out yet.

Once air pollution       in most cities, it is hard      .

The police are trying to find out the _______ of the woman killed in the traffic accident.

His aunt’s letters ________ memories of those beautiful days when they used to live together in his hometown.