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 ratio of red blood cells to white blood cells is abnormal in this patient.
The laboratory will analyse the blood samples for abnormalities.
The immune system will react to the presence of foreign antigens.
The goal is to minimise the patient’s exposure to allergens.
The goal of treatment is to achieve remission in patients with leukemia.
Chronic stress can weaken the immune system and increase the risk of illness.
The surgeon used a minimally invasive technique to repair the hernia.
Molecular genetics studies the structure and function of genes at the molecular level.
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