Parents are concerned that children who have trouble in school will 'fall through the cracks' in the school system. [=will not be given the help they need; will graduate without anyone noticing that they are unable to do the work]
The program is meant to help workers who may have 'slipped through the cracks' [=who may have not been included in other programs] because of their age.
You ought to 'get cracking' [='get going; get moving'] on that assignment. [=you should start working on that assignment right away]
(..) Most likely, the car was used to transport the victim's body, - and then dumped. - That does make more sense. I found a... Excuse me. The crack FBI team found a prescription bottle of erythromycin. That's not an animal drug. That's a macrolide antibiotic used for a number of conditions. (..)2008 TvShow: Bones Title: The Finger in the Nest Season: 4 Episode 3
(..) Drug dealer's dog. Sei jetzt sch n brav! He responds to German commands. Very intimidating. The dog that killed Dr. Elliot has a pronounced crack in its canine tooth, and the neighboring bicuspid shows a slab fracture. - Very distinct. - So Schatzi's not our killer? Schatzi is innocent. (..)2008 TvShow: Bones Title: The Finger in the Nest Season: 4 Episode 3