Please capitalize where necessary: can eu countries restrict access to their national volunteering scheme to nationals?
A: Can EU countries restrict access to their national volunteering scheme to nationals?

Please capitalize where necessary: this modification of the kdv equation resulted in new phenomena.
A: This modification of the KdV equation resulted in new phenomena.

Please capitalize where necessary: on the other hand, the alert student could spot a succession of jokes all made with an entirely straight face and no change of tone.
A: On the other hand, the alert student could spot a succession of jokes all made with an entirely straight face and no change of tone.

Please capitalize where necessary: before you can open a wc file, you'll need to figure out what kind of file the wc file extension refers to.
A:
Before you can open a WC file, you'll need to figure out what kind of file the WC file extension refers to.