帮我翻译一句话！

Question

这句怎么翻译：“我认真的在改变，你不给机会怎么知道，我会让你失望呢？”

Answer 1

I do change seriously. How come you know I will let you down if you never give me a chance?

Answer 2

I am trying to make changes, seriously. How do you know I will disappoint you if you don't give me a chance?

Answer 3

I'm trying hard to change, but how could you know I'll let you down, if you give me no chance?

Answer 4

I've been trying so hard to change myself. How could you see if you don't give me a chance to prove that I would not let you down any more.

Answer 5

I'm really changing.How can you know I will let you down if you don't give me a chance?