| 1 | He majors in physics. | |
| 2 | He specialized in animal species. | |
| 3 | She specializes in computer science. | |
| 4 | After I did my engineering degree, I began to specialize in computer technology. | |
| 5 | By the 6th century BC, athletes began to specialize in particular sports, and even began to hire coaches. |
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