We have started purchasing new products.

His success was rare.

His success was a rare case.

When a fire broke out, the siren sounded.

He is proud of the achievements of his ancestors.

We are looking for a new supplier.

The fire-rat's twist has a characteristic of being strong against fire.

Koizumi-san is my best friend.

He works digging out coal.

This room is cleaned thoroughly, down to every corner.