1.   The prison served as a means of ensuring a supply of labour.

2.   When necessary, bacteria cheat to ensure a supply of new mutations.

3.   He was also critical of PGA officials for their selection of pin placings and failure to ensure supplies of water on the course.

4.   As demand for computer chips surges, people order more than they need to ensure a supply, and companies build more capacity.

5.   As prices rose, though, traders were forced to buy futures contracts to ensure adequate supplies.

6.   -- Citgo Petroleum Corp. will forgo scheduled maintenance on a catalytic cracker in order to ensure adequate supplies.

7.   A synthetic form of the drug had to be developed to ensure adequate supplies for making the cancer drug.

8.   Albert Hale, president of the Navajo Nation, said that, with the help of botanists, they can ensure supplies of peyote for future generations.

9.   Cattle futures fell the daily trading limit after the government said feedlots last month filled their pens, ensuring abundant supplies later in the year.

10.   Cattle sank after the government said feedlots last month filled their pens, ensuring abundant supplies later in the year.