Is this translated text accurate?

He made a firm promise to meet me tomorrow.

He always bothers about me.

On a cold winter night, roasted sweet potatoes are the most delicious.

My favorite pottery is Shino ware.

It became clear that they had made a secret agreement.

They made a secret agreement in secret.

A highly powerful drug is needed to cure this disease.

It is said that if you drink this mysterious wonder drug, you will immediately feel better.

Historically, the Bureau of Interpreters was the agency responsible for interpretation.