________ Children’s Day, all the children are very happy．

1. A.
   To
2. B.
   In
3. C.
   On
4. D.
   At

Children's Day comes ________ June, 1 every year．

1. A.
   for
2. B.
   in
3. C.
   on
4. D.
   at

Children's Day is on June 1st. (提问)
    ____ is Children's Day?