十三、完形填空。(6分)
Raining cats and dogs
“It's raining cats and dogs!” Grandma shouted.
Little Bob ran to the window. He wanted to see the _1_ falling from the sky. He looked out of the window but it was strange that there were no cats or dogs. He only saw small pools of water on the ground.
“Mum, it's really coming down out there!” Uncle Sam agreed _2_ he looked out of the window too. Bob scratched(抓,搔) his head. What was coming down? First they talked about cats and dogs that couldn't be seen. Now someone said “it”. What was going on with these people?
“Wow!” Aunt Susie shouted as she looked out of the window. “It's raining really hard.”

Bob _3_ his aunt. “It is raining hard,” he agreed, “but _4_ are the cats and dogs?”
Grandma laughed. “Bob, that just _5_ it's raining really hard.”
“So why didn't you just say that?” Bob _6_. It was irritating(恼人的) when people were not speaking English at all.
“We did. You just didn't understand these sayings,” Bob's cousin said with a big smile.
“Well, now I do,” Bob said.
( )1.
C
( )2.
B
( )3.
B
( )4.
A
( )5.
C
( )6.
C