QUESTION: Fix punctuation: Instead of throwing it away so it ends up in a landfill polluting the Earth you can organize a campaign in your school
ANS: Instead of throwing it away so it ends up in a landfill polluting the Earth, you can organize a campaign in your school.

QUESTION: Fix punctuation: These user pages have been visited 7021 times since 472011
ANS: These user pages have been visited 7021 times since 4/7/2011.

QUESTION: Fix punctuation: The contents of the courses are based on the needs and interests of students
ANS: The contents of the courses are based on the needs and interests of students.

QUESTION: Fix punctuation: Master data file preparation is a problem especially if the data is spread throughout multiple systems
ANS:
Master data file preparation is a problem especially if the data is spread throughout multiple systems.