Here are the sentences based on the clues provided:

1. The Grand Canyon is a majestic wonder carved by the Colorado River in the USA.
2. They said they climbed the mountain peak to watch the sunrise the morning after.
3. What are the things we should not miss once we come to Hue City?
4. I suggest traveling by motorbike as you can see lots of beautiful scenery along the street.
5. Crater Lake stands as one of the most iconic natural wonders of the United States.
6. The tour guide explained that Niagara Falls harbors diverse wildlife and its surrounding habitats.
7. I claim that Ma Pi Leng is one of the most dangerous passes in Vietnam.
8. Locate Ninh Binh/Trang An Landscape Complex to know its scenic landscape and boat cave tours.
9. There is a growing recognition of the ethnic groups in the Central Highlands needing more support.
10. Her teacher suggested that she study harder so she can get into a good university.