original (document)

I keep the original.

私は原本を保管します

I keep the important original.

私は重要な原本を保管します

I keep the original of the important contract.

私は重要な契約の原本を保管します

I keep the original of the important contract in the company safe.

私は重要な契約の原本を会社の金庫に保管します

I keep the original of the important contract safely in the company safe.

私は重要な契約の原本を会社の金庫に安全に保管します