Gel electrophoresis question
You are being too smart for this question ;) If you assume that the enzyme is perfect, you've optimized the amount of template, and you leave the reaction for a really long time then there will be complete digestion. If you assume complete digestion, then there won't be any 1.1kb fragments. Furthermore, if you work out all the possible orientations of the 800bp and 300bp that were ligated together (each piece can be in the orientation shown and the opposite orientation) and you force an EcoRI cut at every available EcoRI site, then you won't have any 0.4 kb fragments from imcomplete digestion, either. 

In reality, I've never been able to optimize my reaction conditions to get complete digestion of my template, and I always have some residual template around, so it's good your thinking that way for "real-world" preparation.

If you do not assume incomplete digestion, in addition to the 1.1kb and 0.4kb bands missing from this gel, I calculate that there should be a 1kb band as well.



Edit: I goofed up the last paragraph. It should read: "If you do not assume complete digestion, in addition to the 1.1kb and 0.4kb bands missing from the complete digestion gel, I calculate that there should be a 1kb band as well.