Ответ:
It's a pencil. They're pencils.
It's a coin. They're coins.
It's a ticket. They're tickets.
It's a window. They're windows.
It's a watch. They're watches.
It's an address. They're addresses
It's a class. They're classes.
It's a city. They're cities.
It's a diary. They're diaries.
It's a country. They're countries.
It's a dictionary. They're dictionaries.