17. Scuba diving looks exciting. I think I will try it.

=> Trước nó diving nên phía sau phải bổ nghĩa => "exciting"

−- Look + adj: nhìn trông như thế nào..

18. The first time I went rock climbing, I was really scared.

=> Sau really+adj/adv.

−- S + tobe + adj

19. It costs 10 dollars to rent the safety equipment.

−- Ta có cụm danh từ: safety equipment ~ trang thiết bị an toàn

−- Safety(n): sự an toàn

20. Andy has a collection of stamps and postcards from different countries.

=> A+ n/adj .

21. Kate is having a birthday party next Sunday. She sent me an invitation yesterday.

=> An+danh từ(n) ~ (số ít)

−- Invitation(n): lời mời

22. My brother is really into extreme sports like rock climbing or zorbing, but my mum thinks they're too dangerous.

=> S + tobe + adj: ai đó/cái gì đó như thế nào..

−- Dangerous(adj): nguy hiểm