完成句子。

1. Hiking is ________________ (很有趣且振奋人心), but you shouldn't forget safety. (excite)

2. A raft is a small boat ________________ (可以用来) to paddle down rivers and streams. (use)

3. A great wave came,________________ (推倒了树木) before they reached the house. (sweep)

4. We found some photos of ________________ (名胜景区) which were not too far away from

    Chengdu. (interest)