<?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="source">
<item><text>a constant ______ of irritation</text></item>
<item><text>The town obtains all its energy from renewable ______s.</text></item>
<item><text>The census constitutes the principal ______ of official statistics.</text></item>
<item><text>These crustaceans provide a valuable food ______ for some fish.</text></item>
<item><text>The government hopes to tap new ______s of employment in the area of health.</text></item>
</body>
</batch>

