How to print report for Monday AND Tuesday only? (available in version 2009)

You have to go to the days definition dialog and create new entry Monday OR Tuesday:

Once this is done, you can simply select this entry in the filter and only these two days are printed.

This might look a bit complicated, but once you define this special day, you can quickly reuse it further printouts, you can even combined it with some new days and the same system works for weeks and terms if that applies to your school.