Dwyer and Michaels Morning Show Word Puzzle

There is only one word that can be placed successfully in any of the ten numbered positions in the following sentence to produce 10 sentences of different meaning.
 
 

(1) I (2) helped (3) my (4) dog (5) carry (6) my (7) brothers (8) slippers (9) yesterday (10).

 
 

What is the word?

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