1. When did Wu become a volunteer?
2. How often does the hospital hold a piano performance?
3. How long does Wu perform each time?
4. What does Wu think of working as a volunteer in the hospital?
5. How do you like Wu Pinxian?
In 2023.
2. How often does the hospital hold a piano performance?
Once a week.
3. How long does Wu perform each time?
For one and a half hours.
4. What does Wu think of working as a volunteer in the hospital?
It's meaningful.
5. How do you like Wu Pinxian?
She is very kind.
答案：1. In 2023. 2. Once a week. 3. For one and a half hours. 4. It's meaningful. 5. She is very kind/friendly/helpful/warm - hearted.（答案不唯一）