Ответ:

  1. The boys found a man's footprint on one side of the rock.
  2. Huck agreed to become a robber in Tom's gang.
  3. A ransom is the money paid to robbers or pirates.
  4. Tom and Huck could go to the circus only on vacation.
  5. The boys found the treasure-box, a couple of guns and a leather belt.

Перевод слов: footprint — след ноги; robber — разбойник; ransom — выкуп; circus — цирк; leather — кожаный.