For number 6, the correct answer is c) stopped. This is because the word interrupted means that someone or something cuts someone off from finishing the rest of their sentence, as did the lion's roar in this case. Additionally, you could use context clues to know that answer b) wasn't correct, as James's father didn't keep going in this case.
For number 7, I can't be sure of the answer without seeing the passage, however, the answer is most likely a). This is because it makes the most sense in the sentence, as because would suggest that this is evidence supporting his claim that there is a lion in his bedroom and so would suggest that this is the first time James brought this up and his parents expressed their disbelief, which seems unlikely.
