In ___ way, this book is far easier than ___ one I read in the library.
32. I ____ what he said, but I don’t _____ him.
31. Do you know when did the world _____?
30. The coal we use today should _____ plants and trees.
29. That's all for the party. Let's _____.
28. They ____ friends since they met in Shanghai ten years ago.