Who or What does the word refer to?

Lisa found a lost puppy on the street, and she decided to take it home.

The soccer team practiced every day, and they improved their skills.

Tim bought a new skateboard, and he was excited to try it out.

Maria is a talented musician, and she plays the piano beautifully.

The kittens were so adorable and they played together all afternoon.

The principal announced that there would be a field trip and it made then students happy.

Sarah baked a batch of cookies and they smelled delicious.

The weather was very hot and it was a perfect day for swimming.

The teacher gave the students a challenging assignments and they worked hard to complete it.

Peter found some interesting shells at the beach and he collected them.