1. It's time you changed your **behavior**, Curt; you are no longer a child. (behave)
2. The police are interested in the **disappearance** of the valuable paintings. (appear)
3. Upbringing has a great effect on the formation of **personality**. (person)
4. **Childhood** is a time that is supposed to be free of worries. (child)
5. Have you heard about the bank **robbery** yesterday? (rob)
6. The audience burst into **applause** at the end of the play. (applaud)