For "suggest one improvement," pick the cheapest, most obvious fix you can see—like "use a darker pencil for sharper lines on the graph." In our school, if you suggest buying a digital thermometer, they'll just laugh and tell you to make do. For "why repeat the reading," say it's to spot a careless mistake, because in my class, half the time the mistake is just a student knocking the makeshift stand with their elbow.
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