I'm very happy that additional sentences were added to this lesson. There weren't as many yesterday even!
First time seeing "estis". It feels like it's all falling into place...
This video explains where the sentences come from. (skip to the middle)
Jen matenmanĝas, kaj ĝi estas feliĉaj vidi vin!
I used 'pleased' to see him which I think is equally valid as happy and glad