1.I'm terribly sorry for being late, The traffic is murder out there.
2.I'm very sorry I quickly so much that i had forgotten it.
3.I'm sorry I was really looking forward to pick up you, but something has come up.
4.I'm sorry i have a sick last night so i don't have energy to do homework.
5.I apologize for broke your cellphone and now i regret it.i don't hold it good enough,it's my fault.