Question: A sturdy construction Cornilleau indoor boards keep their promise
Please fix the punctuation.
Fixed: [A sturdy construction: Cornilleau indoor boards keep their promise]

Question: The stones served many functions
Please fix the punctuation.
Fixed: [The stones served many functions.]

Question: These language studies build the foundation for further study
Please fix the punctuation.
Fixed: [These language studies build the foundation for further study.]

Question: This allows the intelligence of Windows to decide the correct software application to open your 018 file
Please fix the punctuation.
Fixed:
[This allows the intelligence of Windows to decide the correct software application to open your 018 file.]