Обозначь самый холодный материк. 1) Северная Америка 2) Антарктида 3) Евразия 4) Австралия

Crosses - Present Simple, Active voice

was - past simple, active voice

Covered - past simple, active voice

is being carried out - present continuous, passive voice

come - present simple, active voice

will be watching - future continuous, active voice

has been widened - present perfect, passive voice

have not been sent - present perfect, passive voice