11.   The agency is studying whether emissions are obscuring visibility at Big Bend, Rueda said.

12.   The agency is also studying some health risks of PCBs.

13.   The agency is studying whether some of the Bil Mar products might contain the Listeria bacteria.

14.   And the CDC said the death toll was probably about the same this year, though the agency is still studying that.

15.   At least four agencies are studying the uses of concrete.

16.   Government agencies are also studying the problem.

17.   Government agencies will study the entries.

18.   Held up by disagreements over sending a military force to protect refugees in central Africa, key countries and agencies are studying how to bring order to aid efforts.

19.   Irzal refused to say when the new policy would take effect because the agency is still studying the effects of the move.

20.   Legislation has been introduced to require that federal, state and local agencies simultaneously study the environmental impact rather than conduct separate probes one after another.