1.   But the grants are competitive and spending follows no obvious pattern, with private money bypassing the murky citywide pool to feed single-school tributaries.

2.   His tail disappeared into the murky pool.

3.   In the oil-drilling region, open flames roar out of pipes jutting over murky pools, burning off gas to separate water from the crude oil.

4.   With the historic protection of its market crumbling, the electric industry has been drafting proposals to wade into the murky pool of competition.

5.   Then they launched the submarine so that it chugged across a murky pool, leaving behind a wake.