This certificate of value proves the value of the product.

Please remember to bring your travel documents.

I forgot my identification papers, so I couldn't open an account at the bank.

I had a hard time finding my birth certificate.

May I show you my proof of qualification?

He was researching old records at the public records office.

I bought a new study aid for my math exam.

Scientists are advancing research on nuclear fusion.

His name is a proper noun, known all over the world.

Because of his indecisive nature, he always takes a long time to choose a menu at a restaurant.