Complete the following sentences with appropriate concrete nouns, or identify if no changes are needed:

Here are the completed sentences with appropriate concrete nouns:

a) I have to ride my bicycle to the library to find some picture book on dinosaurs.

b) This sentence has no gaps to fill. The word "loudness" is already present.

c) David's laziness was a complete mess. There were old dishes in the Kitchen sink, still filled with liquid paper, sitting on top of a pile of books. Pencils and screwed up bits of paper of various colors.