I have benjamin watson on the bench,should i drop him for I.Bruce???my other TE is A.Fasano (mia) ?

Unless you've ended up with two top TEs that have some trade value (and neither of yours matches that), I would only keep one TE and use the spot for extra depth at WR or RB. If Bruce is the best WR available and you need one - sure I would drop Watson. As you say, he's injured.