Tourism was the largest industry on the island.
The word "mainstay" is a noun. An example of a sentence containing the word would be: Tourism is the mainstay of this small harbor town.
There is a lot of tourism in Japan.
Tourism brings a considerable amount of revenue to states such as Florida, California, and Hawaii.
Tourism is a big business in Australia.
The tourism industry in Melbourne is very large as there is so much to do there.
use it by saying- how can you use the word ebullient in a sentence?
Can you use the word concluding in a sentence? Done.
How can you use the word infectious in a sentence
You can use the word Truss in a sentence like this.
Just use it! Or do you mean, can you use the word beheld in a sentence.
Since that is not a word I would not attempt to use it in a sentence.
You just did use the word colonize in a sentence.