QUES: When the cost of capital is 3 percent the project is not worthwhile

correct the punctuation.

CORRECTED: When the cost of capital is 3 percent the project is not worthwhile.

QUES: Pinoydental Community and directory of Filipino dentists and dental students

correct the punctuation.

CORRECTED: Pinoydental - Community and directory of Filipino dentists and dental students.

QUES: Such precise reproduction of the wild life became possible not only because of the deliberate work of designers

correct the punctuation.

CORRECTED:
Such precise reproduction of the wild life became possible not only because of the deliberate work of designers.