21.   The second theory is popular among those who know something but perhaps not enough.

22.   The second theory is that an infected bird from western Africa was blown here.

23.   The two experiments confirm the second theory, the Kaufmans said.

24.   What gives rise to the second theory?

25.   With the latest revelations of missing assets and improbable investments in far-off New Zealand, the second theory gains added currency.

26.   A second theory is that right-wing elements in the government or military want to destabilize the government and impose their own rule.

27.   A second theory is that mechanisms of temperature and pressure can cause the glacier to stick very tightly to the ground.

28.   The second theory may be called the capture theory.

29.   There is also a second theory.