Помогите пожалуйста!Очень срочно!Только давайте точно правильные ответы

1. John decided, that he is going to visit his great-grandmother and great-grandfather in 3 days. 2. I didn't know, that their house is on the lake's coast. 3. Anna asked us, were we somewhen on Mississippi coast. 4. Student said, that he can name deserts in Australia. 5. I wanted to understand, why they did that. 6. Little John didn't know, at what temperature does melt metals. 7. We asked, when are we going to visit London next time. 8. He didn't belive, that I have never seen  skyscrapers. 9. Teacher asked, which big river of Russia and America we know.