1-C. it has a vast collection with many permanent exhibits,it has a vast collection with many permanent exhibits,
それは、膨大なコレクションを持っています、多くの常設展示を伴ってダヨ、
2-C. The United States is a vast country.The United States is a vast country.
合衆国は非常に大きな国です。
3. More than one hundred years ago, vast colonies possessed mainly by the Western powers stretched out across the world.More than one hundred years ago, vast colonies possessed mainly by the Western powers stretched out across the world.