Open the brackets. 
1. Mother thought that I (to read) a book, but I (to watch) tv. 
2. Tomorrow everything (to decide). 
3. The problem (to solve) only yesterday. 
4. He (to lock) the door and (to sit) down on the sofa. 
5. Such questions (to ask) very often. 

1. Mother thought that I was reading a book, but I was watching TV.
2. Tomorrow everything will be decided.
3. The problem was solved only yesterday.
4. He locked the door and sat down on the sofa.
5. Such questions are asked very often.