Let's start by identifying the nouns in each sentence and determine whether they are countable or uncountable.
The weather is beautiful on the hills.
Nouns: weather (uncountable), hills (countable)
He saw the milk boiling in the pot.
Nouns: milk (uncountable), pot (countable)
She stepped in a puddle on the way to school.
Nouns: puddle (countable), way (countable), school (countable)
I need some ink for my pen.
Nouns: ink (uncountable), pen (countable)
Hydrogen and oxygen are gases.
Nouns: Hydrogen (uncountable), oxygen (uncountable), gases (countable)
English is a beautiful language.
Nouns: English (uncountable), language (countable)
Water changes into ice on freezing.
Nouns: Water (uncountable), ice (uncountable)
We do not have electricity in our village.
Nouns: electricity (uncountable), village (countable)
I like coffee more than tea.
Nouns: coffee (uncountable), tea (uncountable)
The boy wants sugar in the milk.
* Nouns: **boy** (countable), **sugar** (uncountable), **milk** (uncountable)
Now, let's complete the sentences with suitable nouns and indicate if they are countable (C) or uncountable (U).
We breathe air to live. (U)
Cheese is made from milk . (U)