Контрольная работа по английскому языку

Раскройте скобки и употребите правильную форму глагола ( The Present Indefinite, Present Continuous, Past Indefinite, Future indefinite):
Look at the children: they (to skate) very well.
Look at the children: they are skating very well.
Where your brother (to work)? – He (to work) at an institute.
Where does your brother work? – He works at an institute.