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)

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