Add spaces: Thefertilemeadowsoftherivervalleyprovidedgrassforlivestockinthesummer,andgoodhayforthewinter.

Answer: The fertile meadows of the river valley provided grass for livestock in the summer, and good hay for the winter.
27,studentandnegotiator

27, student and negotiator
[Q]: [perchild(upto12years)]
[A]: [per child (up to 12 years)]
Problem: Add spaces: IrvingKaplansky,writingin,explainsHilbert'sworkwhichledtothisconcept:

Spaces added: Irving Kaplansky , writing in , explains Hilbert's work which led to this concept:
This text is missing some spaces, please add them: Justfillintheholesinthestencilwithhotfixcrystals,pearls,ormetalsandyourdesigniscomplete!Developedinstrictcompliancewiththeprevailingindustrialstandards,thishasanapplicationspecificdesignandiscapableofrenderingyearsofefficientservices.
Just fill in the holes in the stencil with hot fix crystals, pearls, or metals and your design is complete! Developed in strict compliance with the prevailing industrial standards, this has an application specific design and is capable of rendering years of efficient services.
[Q]: [ThereforepraythatIcanbringallyoursacrificesandprayerstotheLord.Thankyouforhavingrespondedtomycall."]
[A]:
[Therefore pray that I can bring all your sacrifices and prayers to the Lord. Thank you for having responded to my call."]