After he arrived at the town,Mark Twain stayed in a small hotel near the station.He went into a room,but when he was just about to have a rest,quite a few mosquitoes flew about him.The waiters felt very sorry about that.“I’m very sorry,Mr Mark Twain.There are too many mosquitoes in our town,” one of them said to him. Mark Twain,however,made a joke,saying to the waiter,“The mosquitoes are very clever.They know my room number.They don’t come into the wrong room.” What he said made all the people present laugh heartily3. But that night Mark Twain slept well.Do you know why?That was because all the waiters in the hotel were driving mosquitoes away for him during the whole night.