Раскройте скобки,употребив глаголы в подходящей видовременной форме. Last Sunday one of

Раскройте скобки,употребив глаголы в нужной видовременной форме. Last Sunday one of my friends (to celebrate) his birthday.When I (to arrive),I (to see) that his flat (to be) full of guests.I (to enter) the living room.Some people (to dance).Several guests (to sing) a merry song and the hostess (хозяйка дома) (to play) the piano.A group of girls (to listen) to music and other people (to watch) the telrlevision.My friend (to introduce) me to his guests when the hostess (to invite) everybody to the table.The party ended late in the evening.I had a very good time there.