10. Why (you/bring) that toy to school last week? Because I (want) to show it to my schoolmates.

10. Why

Why did you bring that toy to school last week? Because I wanted to show it to my schoolmates.

В данном предложении нужно использовать Past Simple, так как действие произошло в прошлом и указано время (last week).

Ответ: did you bring, wanted