What is this mixture made of?

This structure was built centuries ago.

This is the souvenir I brought back from my trip.

My favorite mode of transportation is the train.

Zoo staff must clean up the animals' excrement every day.

I am thinking about what to make her birthday gift.

She felt the pathos of things when she saw the cherry blossoms falling.

Please wear a helmet in this area as there is a risk of falling objects.

She forgot her carry-on.

He overcame the obstacles and achieved his goal.