Fill in the blank with an appropriate option. Just one ______ of paper can lead to a whole lot of fun.

sheet

The correct answer is sheet.

The sentence is about how a single piece of paper can be used for many different activities, which is why "sheet" is the most appropriate word to fill in the blank. A sheet of paper is a single, flat piece of paper, which is what we typically think of when we think of paper. It is the most common way to refer to a single piece of paper that is unattached to others. It is easy to imagine various fun activities (like drawing, folding origami, writing a story, etc.) that could be done with one sheet of paper.

The other options are not as appropriate.

• A bunch of paper is a group of papers that are attached together. It is not clear how a bunch of paper would lead to a whole lot of fun.
• A bulk of paper is a large quantity of paper. It is not clear how a bulk of paper would lead to a whole lot of fun.
• A group of paper is a collection of papers that are not necessarily attached together. It is not clear how a group of paper would lead to a whole lot of fun.