He balled up the letter and tossed it away.
He wadded up the letter and tossed it in the wastebasket.
He folded the letter and put it in an envelope.
Having written the letter, he went out.
I cagerly opened the letter.
The moment he was alone, he opened the letter.
He stood in befuddlement with a letter in his hand.
He shoved the letter into his pocket.
He went to the post office to mail the letter.
The moment that he was alone he opened the letter.