It's more common when you are talking about where do you live to say: I live in Cairo.
I'm living grammatically is OK ... nothing is wrong with it... but to say as I said I live ... more common.
where the beautiful trees and the big buildings.....(where there are beautiful trees ....)
I'm very happy for that.....( I like that ....)but, there are some unpleasant things , such as pollution in the air, and the street unsanitary.
good job Br. Khaled and I appreciate your effort in completing the homework and for your commitment to the course, jazakum Allahu-khieran.