gerund or infinitive

my boss said it's likely (go) back to school soon

Mike cannot understand why people in Korea think it's ok (walk) into a house barefood

(pay) attention to your online classes is important

This book says it's necessary (work) hard to start your own business

I think it's not romantic (give) flowers to a girl

I think (speak) intelligently is very attractive

People say that (be) late is impolite in Mexico

is it necessary (tip) in a restaurant?

My mom says (smoke) is really disgusting

My dad argues that it's easy (dance) salsa but for me just (look) at the moves is terrifying

is (eat) with your hands appropriate in your culture?