Đặt câu hỏi cho bộ phận gạch chân (Wh_question words)

Đặt câu hỏi cho bộ phận gạch chân (Wh_question words)
1. They picked up rubish along the beach last week.
2. The 31st Seagames were held in Viet Nam.
3. I really like swimming because it helps me keep fit.