Пре­об­ра­зуй­те, если это не­об­хо­ди­мо, слово SING так, чтобы оно грам­ма­ти­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

The two ceremonies were joined in 1868, and northern states commemorated the day on May 30. Children read poems and __________________ civil war songs,