Listen to the sentences and complete them with the correct word or words (there will be between 1 and 4 missing).
Spelling is important both in the OET and in your working lives, and this exercise will help you to improve.

The immune system will react to the presence of foreign antigens.
Early screening can detect cancerous cells before they spread.
The patient suffered a major stroke, resulting in paralysis on one side of the body.
The medication error resulted in an adverse reaction in the patient.
The surgeon will section the tumour to remove it in smaller pieces.
The culture medium provided optimal conditions for bacterial growth.
The doctor will define the treatment plan based on the patient’s diagnosis.
The laboratory will assay the blood samples for the presence of antibodies.
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