Please capitalize where necessary: however, it was a costly path that may do not want to take.
A: However, it was a costly path that may do not want to take.

Please capitalize where necessary: depending on your country, the travel agency which sold youthe package may also be your first point of contact.
A: Depending on your country, the travel agency which sold youthe package may also be your first point of contact.

Please capitalize where necessary: make ads more effective
A: Make ads more effective

Please capitalize where necessary: i-roll is used when neither engine power nor engine braking is needed, for instance on flat roads.
A:
I-Roll is used when neither engine power nor engine braking is needed, for instance on flat roads.