This worksheet practices used to. It is useful for all ages. There are three exercises. In the first one, the students have to look at the pictures and say what the person used to do in the past and what he is doing now. In the second, students complete the sentences using used to and a suitable verb. In the third they write sentences about what they used to do, but don't do any more.
If you want to practice more, you can find more of my worksheets about the same topic here