Please capitalize where necessary: do you require a prescription before purchasing on your site?
A: Do you require a prescription before purchasing on your site?

Please capitalize where necessary: on the mac, set the dock to auto-hide in the dock preferences. i never use the dock anymore (see the next section).
A: On the Mac, set the Dock to auto-hide in the Dock preferences. I never use the Dock anymore (see the next section).

Please capitalize where necessary: composting will increase the content of carbonaceous organic material of the soil, which leads to an increase of the water-retaining capacity and the accessibility to nutrients.
A: Composting will increase the content of carbonaceous organic material of the soil, which leads to an increase of the water-retaining capacity and the accessibility to nutrients.

Please capitalize where necessary: this trip is offered daily.
A:
This trip is offered daily.