a jar of jam
a piece of news
A tube of toothpaste
a piece of paper
a slice of bread
A piece/piece of advice
A bottle/glass of water
a pack of wolves
a pair of shoes
A flock of birds/chickens
A group of people
A group of friends
A swarm of ants
A batch of coins
A group of sailors
A fleet of ships
a school of whales
A gang of hooligans
a string of pearls
A herd of cattle/elephants