The sixteenth day is my birthday.

My body has become flexible by doing stretching exercises every morning.

We worked together to achieve our goal.

He used a metal detector to search for treasure on the beach.

In the ecosystem of this area, 'inquilinism', where certain species parasitize the nests of other species, is common.

He was surprised when he saw that huge rock.

Darn, it's raining again.

All the goods in this store are cheap things.

I found a sea anemone on the sea floor.

There are many colorful sea anemones at the bottom of the sea.