1.   A physical examination will let your doctor know about your current state of health.

2.   Doctors do not know the exact cause of the disease.

3.   Doctors do not know what the long-term effects of the drug will be on the unborn child.

4.   Doctors knew that any effort to save his life would be futile.

5.   Give drugs regularly and let the doctor know if you think more pain relief would be helpful.

6.   If doctors could know for certain which individuals would develop the disease, they could treat potential diabetics before the process takes hold.

7.   On the presumption that the doctor knows best, I took the medicine.

8.   The doctors there know all about uranium and radioactive dust.

9.   The doctor knew that there was nothing he could do for her.

10.   Also, doctors know that initial gains may be small, because clinical trials have to start with the sickest, hardest-to-treat patients.