по-моему, RING - неправильный глагол.
ring - rang - rung
поэтому иоя версия такая:
He remembered that he hadn't rung her up in the morning.
1. I didn't call him because I thought he was busy
2.I did't know that he was sick
3.I was sure that they were talking in the garden
4.they told me that he came back from the south
5.I was sure that she receives letters from them
6.he didn't go to the cinema last night since he had an exam tomorrow(это не точно~~)
7. he insisted on going to the library, although he didn't need this book today
8.last year he worked more than this
9.I felt that he did not want to go there
10. I knew that he lived in Moscow
я не знаю, в 10 или was know или все таки knew, так что на свой страх и риск
My last holiday was a seven-day tour in Jaipur in Rajasthan. I chose to go to Jaipur because of its history and beautiful forts and palaces.
I went by train with my family. We arrived at 3 am in Jaipur and were so tired that we went to bed as soon as we checked into the hotel. We woke up in the early afternoon and had lunch. It was a delicious traditional dish.
Then, we went sightseeing in the city. It was a hot day but we enjoyed a lot. I took photograph wearing a warrior armor. It was so heavy but I liked it. City Palace was amazing and huge. There is a central dome where the ceiling is covered with pieces of mirror. It is made up of red and white marble. It looks fabulous!
After spending a few days, I fell in love with the city. I hope to visit again sometime in the future
Suddenly he remembered that he had not rung her up in the morning