I have a little odd question, probably borderline applicable to stackoverflow...
What I am looking to do is to write a Windows program, which I will give my kids to exercise in English spelling as well as grammar. I want it to be in a quiz-like format (like: If we * [to cycle] to Dresden, it will be a fantastic trip). However if there are too few different sentences in a quiz, kids would just remember those, and they will be filling them mechanically instead of learning, so I need to get an access to a big pool of exercises, and those should be in a program-accessible format - xml, or database, or some text with a clear format.
Is anyone aware of any English exercise database available in such form?