You need to either switch off the WYSIWYG Editor or use the source editor available with the WYSIWYG Editor.
Also, you probably need to use {TOKEN:ATTRIBUTE_1} etc instead of {ATTRIBUTE_1}.
Yes, I know, it is weird, but within the survey you need to indicate that this is an attribute from the token table. In the emails it is clear that it is from the token table, because the survey hasn't been filled yet, but within the survey LS probably would search for a question called "ATTRIBUTE_1", I guess. Not the best usability, but hey, grown "organically".