Answer:
"The program was written by Sara, who is an expert in her field."
"To whom should I talk to about the report?"
Explanation:
Who is a pronoun that represents the subject of a sentence:
Who would like to go to the supermarket?
Who built that castle?
Whom is a pronoun that represents the object of either a verb or a preposition:
To whom was the song dedicated?
Whom do you trust?
I am not sure with whom I will go to the concert.
the first one.
they went to great lengths to ensure the tombs were prepared for after life
This is essentially language change at work. Do you know how Shakespeare sometimes sounds "weird" to us? that's because English has changed since then.
Language change is not abrupt, but gradual, and while the change takes place sometimes two forms are used: so while it is likely that in years to come only dreamed will be correct, and in the past only "dreamt", currently the change is not complete and both are correct.
He says this about 59 times in the book