Answer:
sheryl open bronze at first because she /he can take a fuel
Answer: a command(an imperative sentence)
Explanation: You think there is no subject? No, there is an implied "you", so the sentence is a command.
Answer:
Grendel terrorizes Heorot because he is jealous of people's happiness. His jealousy takes advantage of him, and he decides to attack Heorot.
