9. How about using banana leaves to wrap food.

-> I suggest that

10. Why not put garbage bins around the schoolyard.

-> I suggest

C

It would be better if you stop here.

->I suggest

 Let's use energy saving bulbs.

->I suggest

I think we should use energy-saving bulbs to save electricity.

-> I suggest that

I quite like listening to classical music now although I wasn’t keen on it when I was younger.

→ I am used