Answer: 1. Audience
2. Chain
3. Litter
Explanation:
1. The (audience) seemed particularly attentive whenever she was on stage.
2. They pulled the car into an Italian chain restaurant.
3. Even puppies from the same (litter) may react differently when they are ill.
Note that:
Audience are the listeners in a play film etc.
Litters refers to young animals that are born to a particular parent.
