Given that the number 60ab57377 is divisible by 99, where a and b are digits, what are the values of a and b?

Given that the number $60 a b 57377$ is divisible by 99, where $a$ and $b$ are digits, what are the values of $a$ and $b$ ?

Mixed-up sentence exercise

Put the parts in order to form a sentence. When you think your answer is correct, click on "Check" to check your answer. If you get stuck, click on "Hint" to find out the next correct part.