Do the preparation task first. Then read the text and do the exercises.
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'grilled' and 'roast' both go in the 'ways to prepare food' group. This is because they describe two ways you can cook food. Often we use these adjectives to describe meat, but it's also possible to eat grilled vegetables or roast vegetables, for example.
By the way, after you press the Check answers button, you can press the Show answers button if you want to see all the correct answers.
All the best
The LearnEnglish Team