Ответ:

1.I think surfing is dangerous sport.

2.I believe skateboarding is very popular activities.

3.In my opinion mountain biking is exciting activities.

4.I agree that karate aerobics is boring sport.

5.I do not know about that skiing is tiring.

6.I am not sure that snow boarding is very safe.

7.I disagree that cycling is easy.

Объяснение: