1.   Science vainly struggles to keep up, offering hypotheses implicating all manner of causes and suggesting all manner of effects.

2.   American officials have offered many hypotheses for the killing of DeVine, including the possibility that he had stumbled across army involvement in drug or timber smuggling.

3.   Asked why the men would have taken mobile phones that contained phone numbers that could be used to trace their accomplices, an intelligence officer offered a hypothesis.

4.   In addition to citing the cleanliness of cars, the industry spokesmen offered various hypotheses as to why there had been no seat belt problems found in Japan.

5.   On the airwaves and in the press this week, the medical experts are offering hypotheses about CAT scans, opinions about tissue slides and brain injuries.

6.   Some scientists offered hypotheses about how such an effect, if it existed, might occur.

7.   We cannot say for sure, but we can offer a hypothesis.