gerund or infinitive

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

(pay) attention to your online classes is important

My mom says (smoke) is really disgusting

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

I think (speak) intelligently is very attractive

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

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

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

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

is it necessary (tip) in a restaurant?

People say that (be) late is impolite in Mexico