Worksheets completed by students and sent to Google Classroom arrive without the answers

Hello everyone,

The title explains the problem I've had. I registered as a teacher a couple of days ago and I have 3 groups of students, one of 24 students a 2 groups of 16. Last school term my school had an account at LiveWorksheets and I had my students in my account. This term I'm in a new school and I don't have a school account, so I've registered as a private teacher account. Today I posted 2 worksheets at Google Classroom, the students answered them and sent them to me, but the worksheets arrived without the answers. I can see where's the problem. Any suggestions?

Thank you!