1)write an address (at/on/in)the envelope!
2)I like to write letters(to/at/with)my friends
3)she gets beautiful postcards(to/at/on)her birthday
4)little Roo always helps his mother.He puts stamps(on/at/to)enevelopes
5)Ann,put my letter(to/in/into)this envelope,please
plsssssssssssssss helppppppppp