我不知道投诉的确切数量，但肯定在两位数。

I don't know the exact number of complaints, but they are certainly in ___double ___figures.

失业率多年来首次降至个位数。

The unemployment rate has dropped to ___single ___figures for the first time in years.

慈善活动的捐款数额达到两位数，超出了所有预期。

The charity event attracted donations in ___double ___figures, exceeding all expectations.