When investigating the pH (acidic, neutral, alkaline) of a liquid, don't soak the litmus paper completely in the liquid but just put the end of the paper in it.

For example, Pepperberg would show Alex an object, such as a green wooden peg or a red paper triangle.

Like, 'Hey, I just saw a blue paper square!'

Plain white paper will do.

A book is made of paper.

My mother wrapped the sandwiches in paper.

We've run out of paper for the photocopier.

She did the book up in paper.

She wrapped some gifts in paper.

She wrapped the present in paper.

She put down her thoughts on paper.

She ran out of paper.

She handed me a sheet of paper.

She drew a circle on a piece of paper with a pencil.

She folded it in paper.

He gave her a piece of paper.

He told me his address, but unfortunately I had no paper to write it down on.

He drew some vertical lines on the paper.

He wrote a sentence on the paper, but I didn't understand the sentence.

He wrote a letter on a piece of paper.