At two o'clock a bank robber (抢劫犯) stole in. "This is a hold-up," the man said loudly. He took a gun from under his jacket, pointing to George. "Hand it over!" George reached into his money-box and took all the bills from the top part--close to six thousand dollars. The robber took them and turned to leave. Then, while everyone watched the robber, George calmly lifted the top part of the money-box, took bills from the bottom part and put them into his own pocket secretly. The door was shut and the bank robber was gone. George fainted (晕倒). As soon as he was safe behind his bedroom door, George counted the money. He had eight thousand dollars. He was very happy.
The next morning, while the others were checking the bank’s records, George was asked to go to Mr. Burrow’s office and was introduced to Mr. Carruthers, who used to be president of the bank.
"Good morning, George, I was sorry to give you a hard time yesterday, but with all the banks being robbed these days I thought it would be a good idea to prove that our small bank can be robbed, too. I have retired, but I am always thinking of our bank. That’s why I played my little game yesterday, just to keep everyone on his toes. Now, I have put the money back in your money-box all six thousand. "
Which of the following do you think is TRUE?

A．George wanted to protect the money for the bank.

B．George had been thinking of taking money away.

C．This bank had been robbed several times.

D．Nobody knew the bank would be robbed that day.

Why was George asked to go to Mr. Burrow’s office?

A．His stealing money was known to all.

B．Mr. Burrow wanted to say sorry to him.

C．Mr. Carruthers wanted to explain the whole thing to him.

D．Mr. Burrow wanted to tell him the money hadbeen put back.

In this article "to keep everyone on his toes" means ________.

A．to make everyone work hard

B．to keep everyone staying in his place

C．to make everyone do a kind of exercise

D．to keep everyone ready for the coming danger

Why did the writer play the game?

A．Because their bank was once robbed.

B．Because their bank was a small one.

C．Because he wanted to keep his bank safe.

D．Because he wanted to teach George a lesson.

Which sentence can be used to end this story?

A．George turned cold with fear.

B．George turned red with anger.

C．George was pleased with the end.

D．George was excited with the end.