21.   Another, more severe, form of the disease, dengue hemorrhagic fever, is not well understood, but is gaining strength throughout Mexico and Latin America.

22.   As he continued, his voice gained strength.

23.   As he gains strength, he is pulled toward forces that are even more powerful.

24.   As the fire gained strength, destroying their belongings, they tried to save their dog and cat, but gave up.

25.   As the proposition has gained strength, so has he, and together they have pulled well ahead in the polls.

26.   As the misery caused by the economic crisis mounts, El Barzon gains strength.

27.   As the Republicans have gained strength, the president has retreated from some of the core principles and programs he once embraced.

28.   At least one group benefited from signs the economy is gaining strength.

29.   At the meeting, the ministers discussed a monthly report released by the Economic Planning Agency, which said the Japanese economy is gaining strength.

30.   At the same time, the battered bond market has suddenly gained strength.