21.   Trouble could arise, though, if agriculturists find ways to mass-clone livestock and crops as cheaply as Silicon Valley makes microchips.

22.   Trouble quickly arises.

23.   Trouble arises on two fronts.

24.   Trouble arises when Mai finally succeeds in locating their birth mother and brings her to the States.

25.   Trouble arose, however, when the filmmakers had finished their shorts and needed to come to a consensus on the sequencing of the individual narratives.

26.   Understood that troubles would arise, because they always do, but peace in the house would prevail.

27.   When trouble arises, Pattle said, the communication obstacles become worse.

28.   Where trouble often arises, however, is in the definition of deception.

29.   Who is at fault when trouble arises and what can schools do about it?

30.   Portfolio managers, however, could pull out in a flash if trouble arises, as happened in Mexico.