Justification

Here are two ways to format this to have a flushleft (raggedright) margin.

     \documentstyle[12pt]{article}
     \begin{document}
     \begin{flushleft}
     In another moment down went Alice after it, 
     never once considering how in the world she 
     was to get out again.

     The rabbit-hole went straight on like a tunnel 
     for some way, and then dipped suddenly down, 
     so suddenly that Alice had not a moment to 
     think about stopping herself before she found 
     herself falling down a very deep well.
     \end{flushleft}
     \end{document}

Another way to do this is to use the declaration. Notice that the \raggedright declaration is in effect as long as the environment it is in is in effect. Ragged right justification will be turned off as soon as it encounters a \end{ } command.

     \documentstyle[12pt]{article}
     \begin{document}
     \raggedright
     In another moment down went Alice after it, 
     never once considering how in the world she 
     was to get out again.

     The rabbit-hole went straight on like a tunnel 
     for some way, and then dipped suddenly down, 
     so suddenly that Alice had not a moment to 
     think about stopping herself before she found 
     herself falling down a very deep well.
     \end{document}