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You may have finished one round of Duolingo or all of the exercises in Livemocha, then what's next? Looking for more language learning materials could be a treasure hunt. They are available anywhere on the Internet, but you need an effort to find them.
There is no guarantee that those language learning tools you found could be useful and fit your learning style. Thus, it is recommended to keep on trying until you find your perfect match. You may also use several tools at the same with to avoid boredom. This also allows you to have more exposure to different kinds of learning materials.