Ответ:

1. They have visited two theme parks so far. So have we.

But they haven't been on any rollercoaster rides.

2. Have you ever eaten candy.....?

No, I haven't. But I have heard that......!

3. I have never traveled outside.......

Yes, I visited......

4. Have you ever explored the Haunted.......?

Yes, I have. But I haven't seen Peter........