The chosen forms are:
* becoming
* are looking
* seems
Here's why these are the most suitable options:
* Smart Cities are becoming more efficient and connected
* "Becoming" is the present continuous tense because the process of smart cities becoming more efficient and connected is ongoing.
* Smart Cities look modern with smart Infrastructure and digital Technologies everywhere
* "Are looking" is the present continuous tense used for a state that exists now. Smart cities have a modern appearance due to the presence of smart infrastructure and digital technologies.
* The urban lifestyle seems fast-paced and dynamic with endless opportunities for work, entertainment, and cultural experiences.
* "Seems" is the present simple tense used to describe a general opinion or belief. The urban lifestyle is generally perceived as fast-paced and dynamic.