Here are the sentences completed with the appropriate forms of the words provided:

1. The downtown area is always **crowded** with people during the weekends.
2. The city public transportation system is very **reliable**, making it easy for residents to get around.
3. The bus service in the city can be quite **unreliable**, often arriving late or not at all.
4. The new skyscraper is being built on a large **construction** site in the heart of the city.
5. Many people suffer from **itchy** eyes due to the high levels of pollution in the city.
6. The construction site across the street makes the area very **dusty**.
7. The **attractive** shopping malls offer a wide variety of stores and entertainment options.