1)I have an opportunity to be a volunteer to sold flags for Tung Wah Group of Hospitals.
2)It is a challenging job for me because I have never sold flags before.
3)Fortunately,a middle-age man bought the flags from me .
4)He has not recovered from his sadness.
5)I appreciate his bravery.
更新1:
Sorry The First quesion should be 1)I have an opportunity to be a volunteer to sell flags for Tung Wah Group of Hospitals