1) Beijing, China
2) Basel, Switzerland
3) Geneva, Switzerland
4) Washington D.C., U.S.
Explanation:
The 2019 Badminton World Federation (BWF) Para-Badminton World Championships was held from August 20-25, 2019 at St. Jakobshalle in Basel, Switzerland. It was the 12th edition of the tournament. It was the first time that Para-Badminton World Championships is held together with World Badminton Championships in the same venue, as 2019 BWF World Championships was held from 19 to 25 August at St. Jakobshalle in Basel, Switzerland.