Answer:
1. \(\rightarrow\)Is your group rehearsing play for the school anniversary celebrarions at present?
2. \(\rightarrow\) We hope to give more green color to the town and earn more money to the group.
3. \(\rightarrow\)Last year my brother worked as an engineer at a printing factory.
4. \(\rightarrow\)He is now wearing a face mask to protect him from breathing dust.