December     is Christmas Day. Christmas is an important holiday     the United States. On this day, most       get together for a big dinner. They exchange presents and visit friends. The Christmas tree is an important      of the Christmas holiday. Most families buy a tree. The family decorate（装饰） the tree      . Many American children believe in      . In fact Santa Claus is       imaginary（想象出的） person. He has a white beard（胡须） and wears a red suit. Parents always tell their children       Santa Claus brings presents to all good children. He travels in a sleigh（雪橇） and comes      the chimney（烟囱）. He puts the presents       the Christmas tree.
A. 24th           B.25th            C. 26th
A. at            B. in            C. on
A. families       B. friends       C. students
A. part          B. parts         C. holiday
A. alone         B. lonely        C. together
A. Santa Claus   B. their father   C. their mother
A. a             B. the           C. an
A. what          B. that          C. If
A. down          B. into           C. up
A. under        B. at            C. into