It is _____________________ for children to play with sand

It is _____________________ for children to play with sand. ( joy)
..............................., they came home before the snowstorm. ( lucky )
The teacher is____________ the rules to the students now. ( explanation )
There are many .................................................... during the year. ( celebrate )
They broke with ___________ by getting married quietly. (traditional)
giúp mik với các bạn ơi