I'm having trouble rewriting the ambiguous sentences. I have answered them but i'm not sure that they are right.

1. Please close the door behind you. My answer: Please close the door that is behind you.
   
2. we heard that he informed you of what he said in his letter.
   

My answer: We understand that he has written a letter, and that he has told you about the contents of the letter.

1. Charles drew his gun. My answer: Charles took out his gun. 9. Tuxedos Cut Ridiculously! My answer: Prices on our tuxedos have been drastically reduced.
   
2. Don’t freeze your can at the game. My answer: don't throw your can at the game? 21. We’re going to look at lots this afternoon. My answer: We are going to look at a lot of things this afternoon.
   
3. New york’s first commercial human sperm-bank opened Friday with semen samples from 18 men frozen in a stainless steel tank.
   

My answer: New York's first Commercial sperm-bank opened Friday. 18 men gave semen samples, which were frozen in a stainless steel tank.

1. Abraham Lincoln wrote the Gettysburg address while traveling from Washington to Gettysburg on the back of an envelope.
   

My answer: While traveling from Washington to Gettysburg Abraham Lincoln wrote the Gettysburg address on the back of a envelope.

1. In one of Shakespeare’s famous play’s, Hamlet relieves himself in a long soliloquy.
   

My answer Hamlet calms himself by reciting a soliloguy.

1. Please do not feed the animals. If you had any suitable food, give it to the guard on duty.
   

My answer: Instead of feeding the animals give any suitable food you may have brought to the guard on duty.