Here are the completed sentences using the words provided:

1. The traffic policeman is working hard to **direct** traffic and clear the jam.
2. My dad is a police officer. He is **in charge of** ensuring the safety of residents in my town.
3. Rising rent costs in the urban area are causing a lot of difficulties for business **owners**.
4. Traffic jams **dropped** a lot because the city expanded the streets.
5. The drought lasted so long that it affected the corn **crops** in our village.