1.   And children might become fearful of the invisible enemies so bothersome to parents.

2.   And what could be more frightening than an invisible enemy from whom you can only hide, in a world where surveillance is siege.

3.   A bleak comedy of contradiction ensued, played out against the swelling fear of a potentially lethal, totally invisible enemy.

4.   Fewer fighters now battle a largely invisible enemy far from a more material and transient home front.

5.   He then ran a charge at an invisible enemy.

6.   Pursued by this invisible enemy from compartment to compartment, the crew scrambled toward the conning tower to escape contamination.

7.   They lie on their stomachs, facing the periphery, black imitation rifles propped on camouflage backpacks aimed at an invisible enemy.

8.   While lamenting the tightened security, Jewish leaders argue that it is the only defense against a new invisible enemy.

9.   Will we rush off consumed with revenge, swinging wildly at invisible enemies, pulling us into further terrorist attacks or even World War III?

10.   How can we fight an invisible enemy?