Here are the words that do not follow the adjective in each set:

0. **b potatoes** (it's usually "roast potatoes")
1. **a soup** (it's usually "grilled fish" or "grilled sausages")
2. **c salad** (it's usually "boiled carrots" or "boiled potatoes")
3. **c onions** (it's usually "fried chicken" or "fried vegetables")
4. **c chicken** (it's usually "mixed salad" or "mixed fruit juice")
5. **b fruit juice** (it's usually "hot chocolate")

So the circled words are: b, a, c, c, c, b.