He used sellotape to attach the papers.

He was recalling fondly the summer vacations of his childhood.

The petals scattered in the wind.

Fumiko wrote him a letter.

We decided to explore the cave.

This is a model of a mutetrahedron.

Sumi makes sure to stay hydrated.

He taught me how to tie a tie.

This mutetrahedron has a very unusual shape.

The slope continues ahead, so please be careful when driving.