Не похоже на математику)
choose a flag;
colour eggs;
cook cakes;
decorate the house;
eat pudding;
exchang the house;
hang stocking;
have electric lights;
light the Christmas tree;
make a choice of tasty food;
raise fireworks;
send greetings card;
watch parades;
wear costumes;
wrap presents;.
sing song;
сори, если что-то пропустил