Sure! Here are the suggested completions for the sentences with the collocations provided:

1. This morning I got stuck in **traffic**, and I was an hour late for work.
2. More and more people are **stressed** and getting ill because of the pressure of living in a big city.
3. One way to **reduce** rubbish is for supermarkets to use less plastic packaging on the goods we buy.
4. Recently, I decided to try to keep fit, so I’ve started **to go** for a walk instead of driving.
5. At rush hour, there is often a lot of **traffic** in the city center, and it takes a long time to get to where you want.
6. I used to live in quite a **rough area** of town, but there was a lot of crime, so I moved to a nicer neighborhood.
7. A good way to **manage stress** is to take up yoga or meditation.

Feel free to ask if you need any more help!