Predict the next word given an incomplete English Sentence.

Example Input: had retired in haste to his club where he was chatting with some friends upon the events which served as a subject of conversation for three fourths of that city known as the capital
Example Output: of

Example Input: three times did the bell ring with a dull heavy sound seeming to participate in the general sadness before the concierge appeared and peeped through the door
Example Output: which

Example Input: and believed firmly
Example Output:
in