I keep encountering situations where **I would like to quickly include a few "fill-in-the-blank" style underlined horizontal spaces (usually within an enumerated environment)** but each time I come to search the tex.SE, all I find in searches are more specific or advanced applications. Even when I use the "questions that may already have your answer" and "similar questions" I don't find anything that addresses this specific case.

It seems to me I should be able to make this happen relatively easily, **without necessarily loading a new package** (if that's what's best, then that's what's best, but I'm trying to learn how to build up expressions myself, instead of always relying on existing packages), but I can't seem to make it happen.

Until now, I have not posted the question, because I've assumed I'm just not using the right language, but this is the 4th or 5th time that I've done this, so I figure I can't be the only one not finding the result.

Basically, I just want something that behaves like

```
\newcommand{\myBlank}{\underline{\qquad\qquad\qquad\qquad}.}
```

or

```
\newcommand{\myBlank}{\underline{\hspace{5cm}}.}
```

except, instead of a constant length, have it expand to the remaining space on the current line (i.e. until the end of line).

I tried using glue (which I only recently discovered, and know very little about), but that didn't seem to work, either:

```
\newlength{\myBlankSp}
\setlength{\myBlankSp}{10cm plus 10cm minus 15cm}
\def\myBlank{\underline{\hspace{\myBlankSp}}}
```

Any simple solutions? Again, both interested in understanding how to create it, but also ensuring that a simple answer (ideally not just calling a package) is actual findable on the SE, as it seems both useful and as though it's the type of issue that can teach you something important about the way LaTeX works.

## Best Answer

You are looking for

`\hrulefill`

. EDITED to show in an`enumerate`

environment.The OP asks for a deeper line. No problem, by setting the parameters for

`\hrule`

(which is part of the definition of the`\hrulefill`

).EDITED to include definition provided in comments

The macro uses the concept of leaders (the things that allow a string of dots in a table of contents, for example). In this case, though, it uses an

`\hrule`

rather than a dot fill. The actual definition of`\hrulefill`

is`\leaders\hrule\hfill\kern\z@`