Here’s how you can complete the sentences using the structure “...er and ...er” or “more and more”:

1. This project gets **harder and harder** all the time. (hard)
2. I’m just getting **more and more confused**. (confused)
3. It’s becoming **more and more difficult** for me. (difficult)
4. This homework just gets **more and more complicated**. (complicated)
5. He spends **more and more** time on his work. (much)
6. His list of items to do gets **longer and longer**. (long)
7. The knowledge in my mind is getting **larger and larger**. (large)
8. Her problem is just getting **worse and worse**. (bad)
9. Since he has been in Vietnam, his Vietnamese has got **better and better**. (good)
10. My boxes seemed to get **heavier and heavier** as I carried them. (heavy)
11. It’s becoming **harder and harder** to find a good job. (hard)
12. Your listening skill is improving. It’s getting **better and better**. (good)
13. Sonia is **younger and younger**. (young)
14. These days, **more and more** people are learning English. (many)
15. His story was **more and more attractive**. (attractive)

Feel free to adjust any phrasing as needed for clarity!