21.   But analyst Karevoll said more homes could soon come on the market as prices keep rising.

22.   But if stock prices keep falling or fail to rebound, that would play a big role in Fed thinking.

23.   But if prices keep climbing, it may induce homeowners to put their properties on the market as long as they have an equity position, he said.

24.   But in the first quarter, prices just kept heading lower.

25.   But if the price of tortillas keeps rising, she said, she and her aunt may change their menu.

26.   But prices keep rising anyway.

27.   But pharmaceutical companies refused to relinquish their patent rights, and the prices they set kept the drugs out of the hands of millions.

28.   But prices kept rising, and Newton bought again, at the top.

29.   But the AIDS crisis has subjected the industry to criticism that its prices are keeping millions of poor people in Africa from getting vital care.

30.   But the target price has kept dropping as the telecom market cools and companies ratchet back on spending.