Вопрос:

15. David decided to enter the Marathon race next month. David decided to PART the Marathon race next month.

Ответ:

Решение:

Необходимо дополнить предложение, сохранив смысл.

  1. David decided to enter the Marathon race next month.
  2. David decided to take part in the Marathon race next month.

Ответ: take part in