Mr. White was the owner of a hotel in the town. One weekend all of the hotels were full because a large meeting was being held in the town. On Saturday night, three men came into the hotel and asked for rooms. Mr. White explained(解释) that there were no rooms for them. The men didn't want to go because they had no place to stay.

　　Mr. White wanted to help them. He remembered that Room 418, a very small room, was empty. He asked them if they would share(分享) a room. The three men said that they would.

　　Mr. White told them that the room would be $10, and then they went up to their room.

　　Mr. White soon began to feel sorry.“Thirty dollars is too much for the small room.”He called his assistant over and said,“Here is $5. Give it to the men in Room 418. They paid too much for the room.”

　　The assistant took the money. While he was on his way to Room 418, he thought,“How can three men divide(分) $5? I'll give each of them only $1, and I'll keep $2. They'll be happy to get something back. I'll make a little money and Mr. White will never know.”So, he returned $1 to each man.

　　Each man had first paid $10. After the assistant gave $1 back to him, each one had actually (实际) paid only $9. $9×3=$27. The assistant kept $2. $27＋$2=$29. Where is the missing dollar?

1．The meeting was held on ________.

[　　]

2．If there had been empty rooms in the hotel, ________.

[　　]

A．each of them would have had a room

B．the dollar would not have been missing

C．they would still have stayed together in a room

D．they would have had a larger room

3．We can know that ________.

[　　]

A．the money was lost

B．the assistant kept more than $2

C．there was a mistake in calculating(计算)

D．the missing dollar was nowhere to be found

4．Which of the following is not true?

[　　]

A．Mr. White actually took $25 for the small room.

B．The assistant kept no more than $2.

C．The three men paid $27, including(包括) the two dollars that the assistant kept.

D．No one could find out where the missing dollar was.

5．The last sentence shows that ________.

[　　]

A．Mr. White found one dollar missing

B．The assistant wondered where the missing dollar was

C．The writer was not good at maths and asked the readers a foolish question

D．The writer put a puzzling question to the reader