Which sentences contain an adverb clause?

What is the problem with the following sentence: cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.

What does a change in medium allow the audience to do?

In the sentence above, which verb is the irregular verb? a. laid b. warmed c. removed d. walked