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.

Chronic stress can weaken the immune system and increase the risk of illness.
The initial diagnosis was pneumonia, but further tests revealed tuberculosis.
The virus’s source is believed to be animal-to-human transmission.
The patient experienced a muscle strain while lifting heavy objects.
The bacteria will incubate in the culture medium overnight.
Administering medication is an important task for nurses on the medical ward.
The immune system will react to the presence of foreign antigens.
The blood agar medium is commonly used for culturing bacteria.
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