he had to bear ..... all the difficulties at his own . 1) up 2)of 3)off 4) on

The correct word to complete the sentence "he had to bear ..... all the difficulties at his own" is "with."

Therefore, the complete sentence should read: "he had to bear with all the difficulties at his own."

Explanation

1. "Bear with" is an idiomatic expression used to mean being patient or tolerant while dealing with difficulties or challenges.
2. The other options ("up," "of," "off," "on") do not appropriately convey the intended meaning in this context.
3. Hence, the best choice for this sentence structure and meaning is "with."

In summary, when faced with challenges, it is often necessary to bear with them while managing them appropriately.