What holds water yet is full of holes?

You can complete the letter below negatively and positively by inserting . , ! or ? (You can not remove any words or change the order of them!)

Dear Jack,

I want a man who knows what love is all about you you are genious kind throughfull people who are not like you admit to being to uselers and infenor you have ruined me for other man I yearn for you I have no feelings what so ever when we are apart I can be forever happy - will you let me be yours Jill

On a train, Smith, Robinson, and Jones are the fireman, brakeman, and the engineer, but NOT respectively. Also aboard the train are three businessmen who have the same names: a Mr. Smith, a Mr. Robinson, and a Mr. Jones. Using the clues below, can you determine the identity of the Engineer?

1. Mr. Robinson lives in Detroit.
2. The brakeman lives exactly halfway between Chicago and Detroit.
3. Mr. Jones earns exactly $20,000 per year.
4. The brakeman's nearest neighbor, one of the passengers, earns exactly three times as much as the brakeman.
5. Smith beats the fireman in billiards.
6. The passenger whose name is the same as the brakeman's lives in Chicago.