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 approximate duration of the surgery is two hours.
The medical team will evaluate the effectiveness of the new drug in clinical trials.
Nuclear medicine uses radioactive tracers to diagnose and treat disease.
The nurse will assess the patient’s vital signs before administering medication.
The release of histamine causes inflammation in response to allergens.
The molecular structure of the protein was determined using X-ray crystallography.
The physical therapist will strain the liquid from the gauze before applying it to the wound.
The immune system will react to the presence of foreign antigens.
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