1. at in on They sing carols _____ Christmas. at

2. at in on He goes camping ______ Easter. at

3. at in on My grandmother was born ___ the 20 th century. in

4. at in on Santa delivers the gifts ___ Xmas Eve. at

5. at in on They got married _____ Saturday. on

6. at in on This hotel was built_____ 1936. in