Natural wonders are very important. We should protect them. First, we must not throw trash in nature. We should keep the environment clean. Second, we can plant more trees to make the air better. When we visit these places, we need to follow the rules. We should not damage plants or animals. The government should also protect these places. Schools can teach students about nature. If everyone helps, we can keep natural wonders beautiful.

1. Last week, the ranger showed the group trees which are native to the area.
2. This course includes activities whose purpose is to improve speaking skills.

1. The Mekong Delta is a unique area because it is home to a rich variety of wildlife.
2. She asked students if they understood English grammar well.
3. He asked when the best time to visit the Amazon Rainforest was.