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.
Explanation:
Explosion frightened us.
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Answer:
Irony
Explanation:
Its ironic because the teacher is pushing homework onto his student while he loathes doing homework.
This is a little late but I thought I would post this anyways.