if necessary. This may explain why we are not usually sensitive to our own smells-we simply do not need to be. We are not of the usual smell of our own house but we new smells when we visit someone elses. The brain finds it best to keep smell receptors for unfamiliar and emergency signals the smell of smoke, which might indicate the danger of fire 1. [A] although [c] but [D] while 2. [A] above unlike [C] excluding [D] besides 3. [A]limited committed [C] dedicated D] confined 4. [A] catching tracking 5. [A anywayif necessary. This may explain why we are not usually sensitive to our own smells—we simply do not need to be. We are not of the usual smell of our own house, but we new smells when we visit someone else’s. The brain finds it best to keep smell receptors for unfamiliar and emergency signals the smell of smoke, which might indicate the danger of fire. 1. [A] although as [C] but [D] while 2. [A] above unlike [C] excluding [D] besides 3. [A] limited committed [C] dedicated [D] confined 4. [A] catching ignoring [C] missing [D] tracking 5. [A] anyway