Ответ:

Решение:

  1. 1 popular with
  2. 2 bad for
  3. 3 responsible for
  4. 4 keen on
  5. 5 used to
  6. 6 worried about

Ответ: 1 with, 2 for, 3 for, 4 on, 5 to, 6 about.