Here's the JSON response for the exercise:
```json
{
"q": "Add question tags to the sentences and give short answers.",
"a": {
"0": "Claude Monet is a famous French painter, isn't he? Yes, he is.",
"1": "By 1907 he started to go blind, didn't he? Yes, he did.",
"2": "Still, he painted some pictures, didn't he? Yes, he did.",
"3": "The Water Lilies mural is among them, isn't it? Yes, it is.",
"4": "Alexey Maresyev was a Soviet pilot during World War II, wasn't he? Yes, he was.",
"5": "His airplane was shot down over the fascist-occupied territory, wasn't it? Yes, it was.",
"6": "Maresyev was wounded, wasn't he? Yes, he was.",
"7": "He couldn’t walk, could he? No, he couldn’t.",
"8": "Still, he managed to get to the Soviet territory, didn’t he? Yes, he did."
}
}
```