Pastor Mark,
It is not quite clear what you are after. Perhaps introduce text in a
particular way. If you use an animation path you can float text in. Sort of
depends what you mean by float. There is an entrance animation also. Select
your text, go to the custom animation task pane, click add effect, entrance,
in the exciting category there is an effect called float.
Guess we need some clarification.

If you want to use the animation 'float' to replace a blank you will have to
create a new text box with the answer, align with the space and give it an
entrance animation. You might also want to look at this
method.http://www.technologytrish.co.uk/ppttipscloze.html