---Bob has got his trousers dirty again!---Don’t be angry with him. , he’s only a five-year-old child.
—____ is Mary? —She is five.
—Are they from Canada? —No, they ____.
—____, are you Mr. Wang? —Yes, I am.
—____ your name? —My name is Kate.
下列各组字母中全部是元音字母的是 ____。