Употребите артикли a, an, the , где требуется

1. ___ United States is between ____ Mexico and _____ Canada.

2. Yesterday I had ___ party. ____ party was very funny.

3. ___ Alps are ____ highest mountain in ___ Europe.

4. I work in ____control room operators.

5. We control ___ refinery.

6. I am ___ supervisor.

7. We refine ___ oil