The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

The hopeful news is that there is still time to stem the tide - to prevent the next wave of youth crime But we must act now - by reinvesting in schools, recreation, job training, support for families, and mentoring. We must act now while this baby-boomerang generation is still young and impressionable and will be impressed with what a teacher, a preacher, or some other authority figure has to say. If we wait until these children reach their teenage years and the next crime wave is upon uS, it may be too late to do much about it.
The urgency of immediate （）