A:①②
B:①③
C:②④
D:③④
One night, Mary heard some big1noise. “Doh, Doh, …”It2 for a few minutes. Mary went out of her bedroom to search everywhere. Her parents were sleeping and there were no 3people in the house. Mary 4 to her bedroom. Mary heard the noise again. She thought, “Is it a cat? Mike has a cat. But cats miaow. They don't make such noise.” “Maybe it's a bird5 around and looking for a place to rest. No! That doesn't make any noise.” Maybe it's the whisper of my parents. They 6 be7in their room. But that noise wasn't a whisper at all.” Mary went to bed again but she heard the noise again. She was 8 and fell 9 her bed. Her legs were10 and she could not climb up any more.