<span>C) The chipped glass was replaced with a new one.
The easiest way for me to identify passive voice is to look at the subject and verb of the sentence. Passive voice happens when the subject is receiving the verbs action rather than doing it. For example, in option A the subject is the waiter and the verb is apologized. The waiter is the one doing the apologizing so this is NOT passive voice. However, in option C, glass is the subject and replaced is your action verb. The glass can't do the replacing. The glass is receiving the action of being replaced. This means it is written in passive voice.
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"You'll manage rehearsals, actors, technicians, props and costume fittings, and liaise with front-of-house staff and the director. You'll need to have a good understanding of both the technical and artistic elements of a performance so you can ensure it is delivered exactly to the director's requirements."
So basically, a stage manager is like the manager of everything, it's an important job. You'll have to make sure everything is in order and that everything is how it's supposed to be, like the clothing, the place where people will be acting, etc.
For the Stage Manager in Our Town, I wouldn't know as I haven't read the bok.
A widely accepted way of thinking or behaving is a convention.
It denotes set of generally accepted standards and norms and a way in which something is usually done. Example for convention is shaking hands when greeting someone. Controversial on the other hand is something causing people to have opposing ways.