Here are the completed sentences using the comparative + and + comparative structure:

1. It is becoming **harder and harder** to find a job.
2. His visit to New York seemed to get **shorter and shorter** because he was very busy at work.
3. Eating and travelling in this city is getting **more and more expensive**.
4. As the day went on the weather got **worse and worse**.
5. We had to stop the discussion because the question was becoming **more and more complicated**.
6. Your English is OK now, your pronunciation has got **better and better**.
7. Little John is becoming **more and more active**.