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