Please capitalize where necessary: the ones that start with the "t-h" are singular.
A: The ones that start with the "T-H" are singular.

Please capitalize where necessary: saving lives at even higher speeds.
A: Saving lives at even higher speeds.

Please capitalize where necessary: here we have selected campanula haylodgensis, which has a feminine and delicate expression.
A: Here we have selected Campanula haylodgensis, which has a feminine and delicate expression.

Please capitalize where necessary: management of hypopituitarism is usually conducted on an outpatient basis.
A:
Management of hypopituitarism is usually conducted on an outpatient basis.