I am not sure whether I can answer these answer probably even when I am almost 30 years old right now. However, the teachers expected a 5 years old child to answer these questions.
1. 「What's the difference between clinic and hospital？」 I am not sure whether I know how to say "I don't know." when I was five. However, I am sure if I do know how to say "I don't know." at that time, that would be my answer.
2. 「If I give you $10000, what will you buy?」 Again, I would say I don't know, because I could not imagine what's the purchasing power of HK$10K when I was five.
Now, I would say, I want to buy all of your fantastic answers and end this fucking interview.
3. 「請用普通話唱出一首兒歌」 Sorry, this one I gave up. I haven't heard any Putonghua song for children before.