Поставьте глаголы в скобках в правильное время. Last night my brother ( to celebrate) his birthday. When I (to come) home, mum (to make dinner) already and (to bake) something in the oven. I (to enter) the living-room. Some boys and girls (to dance). Several guests (to sing) a song and my brother (to play) the piano. A group of girls (to listen) to music and other people (to talk). I had a very good time last night.