1 2 3 4 1 _ _ _ _ 2 _ _ _ _ 3 _ _ _ _ 4 _ _ _ _ ACROSS 1) a necessary or essential thing 2) a singer whose voice lies in the ____ clef 3) a state of agitated irritation 4) a respiratory disease of unknown etiology that apparently originated in mainland china in 2003; characterized by fever and coughing or difficulty breathing or hypoxia; can be fatal DOWN 1) the property of a body that causes it to have weight in a gravitational field 2) the inner and longer of the two bones of the human forearm 3) a prominent or sensational but short-lived news event 4) a small amount (especially of a drink) ** Scroll down for solution. ** Are you sure you want to peek? must alto snit sars