Put the verbs in Present Simple:
Before Christmas, children....(to write) a letter to Santa Claus with their wishes. Then on Cristmas Eve they ....( to leave) for him food or drinks. They ....( to believe) that Santa Claus ... ( to put) presents in their Christmas stockings. They also .... (to believe) that Santa ... ( to live) at the North Pole and ... ( to make) Christmas toys for children. On Christmas Eve he .... ( to fly) to the houses of all good cgildren and .... ( to bring) them presents.