He picked up the bunch of keys from the floor, and twirling them round in his fingers finally selected one, very bright and shining, which he tried in the lock of the purple despatch-case. 
The purple despatch-case required a key to open.
He picked the dull key.
He didn't see anyone on his way home but he still held the letter which was ample evidence.
A man is riding a horse on the beach.
A black dog is running.
The boxer lands a left hook.
The giant picked them up so they could see how ugly it was.
The person sits.