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In each of the following sentences, a preposition is missing.
As he is an elderly man, he has a difficulty ________ using the computer.
This is a simple method ________ searching suitable solutions.
She was in trouble _________ robbing a car.
The alternative that respectively brings the correct preposition for each one is
of / in / for
about / by / for
in / of / for
of / of / when
in / on / by