He is good at playing the black keys.

She played the white keys of the piano briskly.

My boyfriend gave me a gift.

Everyone was surprised by the news.

You must never show this secret key to anyone else.

He encrypted the message using a public key.

Let's exchange keys tomorrow.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

Using the private railway makes commuting very convenient.