Please capitalize where necessary: over the past year, a number of new life-cycle analyses have come out that all ask different versions of the question, "how clean is natural gas really, on a life-cycle basis?"
A: Over the past year, a number of new life-cycle analyses have come out that all ask different versions of the question, "How clean is natural gas really, on a life-cycle basis?"

Q: the results also showed that biomass technologies were the most expensive.

A: The results also showed that biomass technologies were the most expensive.

Q: the child car seat perfectly adjusts to the vehicle seat.
A: The child car seat perfectly adjusts to the vehicle seat.

Problem: country, language and currency
Can you repeat this sentence, but capitalize it?
Answer: Country, language and currency

Text: a strobe tachometer is a useful tool because you can't always get access to the machine shaft to stick a piece of reflective tape to use a laser tachometer or make contact with the moving shaft to use a contact tachometer - using a stroboscope you can "stop" the shaft down to 30 rpm (fpm).

Correct capitalization: A strobe tachometer is a useful tool because you can't always get access to the machine shaft to stick a piece of reflective tape to use a laser tachometer or make contact with the moving shaft to use a contact tachometer - using a stroboscope you can "stop" the shaft down to 30 RPM (FPM).

Problem: he said he could not blind himself to the alarming position: "economically the country is on the verge of bankruptcy.
Can you repeat this sentence, but capitalize it?
Answer:
He said he could not blind himself to the alarming position: "Economically the country is on the verge of bankruptcy.