A postmortem was ordered to try to ascertain the cause of death.
Before infusing insulin lispro, the manufacturers instructions should be studied to ascertain the suitability or otherwise for the particular pump.
I'm merely trying to ascertain the facts. The police have so far been unable to ascertain the cause of the explosion.
It was difficult to ascertain who was telling the truth.
The fire department has been unable to ascertain the cause of the fire.
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