You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.
--------
Question: had retired in haste to his club where he was chatting with some friends upon the events which served ____ a subject of conversation for three fourths of that city known as the capital of the world at the precise time when madame danglars dressed in black and concealed in a long veil

Answer: as

Question: unfortunately in this world of ours each person views things through a certain medium and so is prevented from seeing in the same light as others and madame ____ therefore very much regretted that the marriage of eugenie had not taken place

Answer: danglars

Question: there'd be no scope for imagination then would there but am i talking too much people are always telling me i do would you rather i didn't talk if you say so i'll stop i can ____ when i make up my mind to it although it's difficult matthew

Answer:
stop