The answer is 'colluded', because it means that they schemed to do it secretly. The other options aren't possible here, and most of them are adjectives, and you need a verb.
Answer:
"slowly and cautiously"
Explanation:
This phrase helps describe the verb "climbed" within this sentence.
Answer:
she was never heard from again
Explanation:
nothing to catch her was below her
His gratefulness, as shown when Crusoe saves his life.
