Here are the answers to your prompts based on the terms provided:
- More difficult of the two types of serves - I. overhand serve
- Version of volleyball played two-on-two - j. Beach volleyball
- The boundary where the serve is made - g. end line
- Version of volleyball played six-on-six - e. standard volleyball
- What you would do if you make contact with the ball above shoulder level - d. setting (assuming you are preparing to hit)
- The serve used more by novices - b. underhand serve
- Hitting the ball to an empty part of the playing area - h. Ace
- What you would do if you make contact with the ball below shoulder level - c. passing
- The apparatus used to divide the field of play - f. Net
- Skill used to finish a point - a. spike
Let me know if you need any further assistance!