<?xml version="1.0"?>
<!DOCTYPE BATCH SYSTEM "exercises_oup.dtd"><batch>
<exercise subhead="dragdrop"/>
<media type="none"/><head><title>Sentence Match</title><task>Type in the word missing from the sentences.</task></head>
<body findword="immunity">
<item><text>Infection usually confers lifelong ________ to the disease.</text></item>
<item><text>Polio has been eradicated due to vaccination and herd ________.</text></item>
<item><text>Once you have had a cold you build up ________ to that particular virus.</text></item>
<item><text>The vaccine only confers ________ for a few months.</text></item>
<item><text>the use of vaccines to stimulate ________</text></item>
</body>
</batch>

