He checks the locking up of the house every night.

He locked the door and shut us out.

Please shut the window.

A back vowel is a sound where the back of the tongue approaches the palate.

Kouke is my best friend.

My university is in Tokyo.

My high school has very strict rules.

My younger brother is learning cooking at a vocational school.

My sister is attending a boarding school.

My child goes to a public school.