Sure! Here are the suggested answers for the blanks:

1. **Years** (e.g., "Five years ago")
2. **Together** (e.g., "together")
3. **Surfboard** (e.g., "surfboard")
4. **A** (e.g., "a national" or "a regional" - depending on the context)
5. **Win** (e.g., "win")

So, the completed dialogue would read:

Wave: When did you start kayak surfing?

Adam: (1) **Five years ago**, I went kayaking a few times with my family. Later, my brother took me to the beach and we went kayaking (2) **together**. I have been a fan since that day.

Wave: Most people haven’t heard of kayak surfing. What is it?

Adam: It’s like surfing, but you are in a kayak, not on a (3) **surfboard**. The sport has become a lot more popular in the past few years.

Wave: Have you had much success in the sport?

Adam: Yes, I have won several medals so far including (4) **a** world championship.

Wave: When did you (5) **win** that?

Adam: in 2009.