He used sonar to explore the seabed.

Every night, he starts working at midnight.

The inside of the train was crowded.

We have a duty to pay taxes.

The children are playing in the sandpit.

He called himself an anarchist and was opposed to the authority of the government.

I am going to Tokyo for company business today.

Mr. Takasu is my best friend.

I made sunomono for dinner today.

Could you please tell me more about your company's new product?