1. My friend was sure that Ferdinand Magellan had discovered Australia. But I told him he was wrong. 2. Our history teacher explained to us that the Revolutionary War in America had taken place in the 18th century. 3. Betty knew that she had done everything she could to win the competition. 4. We asked Professor Smith when he had came to Moscow how many places of interest he already had seen. 5. Little John believed that Canada was in the South of the American Continent. 6. We all wanted to know where in New York the Statue of Liberty was situated. 7. The children asked what cities in the USA we had seen. 8. Father told me that I had made a mistake in my school test. 9. We all knew that Germany had declared war on several European countries in 1941. 10. He said he always supported me. 11. Not all the pupils knew that the US President was the Commander in Chief of the country's armed forces.
6. a) the latter - Пояснение:
Use latter to refer to the second of two persons or things that have been mentioned. When more than two have been mentioned, use last.
For example:
He preferred oranges to apples, because the latter were not as juicy.
He saw Leathal Weapon 1, 2, and 3 and liked the last one most.