Need code to make completion of certain cells mandatory before saving file

Hello, Thanks in advance for reading this and any help provided. I'm new to VBA so any help is appreciated!

I need to make a form unable to be saved before all the required cells are filled in. It's for work and we've a problem with people sending in request missing required information.

The required cells are: F10,G10,F11,F14,F15,F19,F20,F21,F22,F23,F24,F25,F26,F28,I28,F32,F35,F37,F40,F41,F42,F44,F45,I45,F46,F47

Some of these are merged cells, would that make a difference to the code required? e.g. G10 is a merged cell made up of G10,H10 & I10.
A number of cells contain drop down menus (F10,F24,F25,F42,F44,F45,I45,F46,F47) so would that matter?

I have the code that works for cell G10 but don't know how to edit it properly to make it so all the other required cells are also checked. The sheet in question is called CCL.

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
  If IsEmpty(Sheets("CCL").Range("G10")) Then
    Sheets("CCL").Activate
    Range("G10").Select
    MsgBox "Fill in Employee Name before saving."
    Cancel = True
  End If
End Sub