Hi list

I wonder if I can typeset a cloze text using context. The gaps (__________)
must have a given length (say in cm or the length of a given word, given
sentence) and must break at the end of a line.

\hl[4] is nice but won't do the trick since it won't break. \fillinline and
others fill the hole line, but I only want to fill a given size.

Are there some ideas how to deal with it?

Example:

The name of the _____________ is _____
________. And now it's time to go to bed.
Some more text.....

Hope you get the point.

Thanks in advance
Christian

PS.: For Latex there is a package:
http://tex.stackexchange.com/questions/79689/control-ulines-for-cloze-text