One of my most popular YouTube videos explains how to create a fill-in-the-blanks item in Word. The technique demonstrates how to add a blank line to a document, but it really works best only when you’re printing a document. For adding a fill-in-the-blanks item in a document electronically, you need to use something called a Content Control.
You can watch my original video here. I also wrote a blog post on the topic a few years back, though the video is visual and many people prefer that technique for learning computer stuff.
If you need brushing up on content controls, you can read this post. Thanks to suggestions from my YouTube viewers, I decided to do a video on the Content Controls for generating a fill-in-the-blanks item. Here it is: