Ответ:

Cheap - expensive

Clean - dirty

Comfortable - uncomfortable

Convenient - inconvenient

Fast - slow

Modern - old-fashioned

Reliable - unreliable

Safe - dangerous

Ответ:

inconvenient-convenient

dangerous-safe

uncomfortable-comfortable

expensive-cheap

slow-fast

unreliable-relaible

dirty-clean

old-fashioned-modern

there are very comfortable bus seats in my city

there are very clean streets in my city

but very expensive products

cars relaible but always drive fast