1.   Doctors cannot explain why some people lack the power to fight off the disease.

2.   Doctors should always explain the reasons for prescribing any medication.

3.   Doctors should explain their instructions to patients carefully, to avoid any confusion.

4.   Doctors usually explain the risks of the treatment to patients.

5.   The doctor explained how the clinic operates.

6.   The doctors must explain the uncertainty of the outcome when seeking permission to include some one in the study.

7.   Your doctor should explain the pros and cons of the different treatments available.

8.   And as doctors have explained, the bigger an athlete gets, the more vulnerable he becomes to heat-related illness.

9.   Cheney said the doctors had not explained why tests performed in July did not provide hints whether the diagonal artery was blocked.

10.   Doctors cannot explain exactly when, but they know Anna Cheeseman had a stroke in the hospital delivery room on the day of her birth.