Read the text. Change the forms of the given words to make a grammatically correct text

Do you know when the [ ] computer mouse appeared? It [ ] more than 50 years ago. The first computer mouse was publicly presented on December 9, 1968 by Douglas Engelbart. Earlier, he also [ ] the first mouse prototype in 1964. The invented device had a wooden case with wheels inside and a long wire which [ ] like a tail. Douglas and his colleague Bill English [ ] the people who named the device "mouse". However, it [ ] the only invented device at that time. On October 2, 1968 a German company presented another mouse-like device. It was named Rollkugel, which means a "rolling ball" in German. It [ ] the shape of a half ball and made contact with the working surface using a trackball inside.