Singular nouns that end with 'y'

I use ___ to change singular nouns that end with 'y'.

Are you enjoying the video lesson?

• Yes

• No

If there is more than one puppy, we write _____.

• puppys

• puppies

• more than 1 puppy

If there is more than one city, we write _______.

• cities

• citys

• more than 1 city