question: have a comment or question about our productsor service? let us know
Capitalize this past sentence correctly.
A: Have a comment or question about our productsor service? Let us know

question: there won't be any risks involved in making use of your credit cards because they are processed via protected payment systems.
Capitalize this past sentence correctly.
A: There won't be any risks involved in making use of your credit cards because they are processed via protected payment systems.

question: emissions reductions, energy, natural gas, renewable energy, united states
Capitalize this past sentence correctly.
A: emissions reductions, energy, natural gas, renewable energy, United States