Amir and Parthiv are friends. I know Amir and Parthiv very well. (Rewrite using pronouns)
Amir and Parthiv are friends. I know these very well.
Amir and Parthiv are friends. I know him very well.
Amir and Parthiv are friends. I know those very well.
Amir and Parthiv are friends. I know them very well.
Fill up with the adverb form:
Angrily
Angered
Angry
Angrously