A terrible earthquake happened．Thousands of houses fell down．A young father rushed to his son's school at once．When he saw the beautiful teaching building turned into ruins（废墟），he was shocked．"My son，where are you？"He lay on the ground and cried out loudly．

Suddenly he thought of the words he often said to his son，"No matter what happens，I'll be with you!"He started to dig in the ruins．Other helpless parents and the firemen arrived and tried to pull him off the ruins，saying，"It's too late!They‘re all dead!There's nothing you can do!"But he kept on digging without anyone's help，because he believed that his son was still alive．

8hours…12hours…24houes…36hours passed，then in the 39th hour，he pulled back a rock and heard his son's voice．He shouted his son's name，"AEMAND!"He heard back，"Dad!It's me，Dad!I'm sure you'd save me if you were alive，You promised，‘No matter what happens，I'll always be there for you!'you did it，Dad!"

"What's going on in there？How is it？"the father asked．

"There are 14of us left out of 33，Dad．We're frightened，hungry，thirsty and thankful you're here．"

"Come out，boy!"

"No，Dad!Let the other kids out first，because I know you'll get me!No matter what happens，I know you'll always be there for me!"

50．What did the father do first the earthquake happened？___

A．He shouted to his son．

B．He thought of the words．

C．He rushed to look for his son．

D．He started to dig in the ruins．

51．Other parents and the firemen wanted to pull him off the ruins because they thought___．

A．it was too dangerous．

B．all the children had died．

C．he was not strong enough．

D．it was impossible to dig alone．

52．How many students were already dead when the father found them in the ruins．___

A.14

B.33

C.19

D.47