读下面的短文，按顺序指出他们的名字。
This is a picture of my brothers and sister. The first boy from the left in the green sweater and black
trousers is Danny. He is nineteen years old. The second boy in the brown trousers and red shirt is William.
He's ten years old. And the third one in the blue dress and blue shoes is Sandy. She's thirteen years old.
The fourth one in the brown skirt and yellow blouse (女衬衣) is Sally. She's fifteen.
1. The first one is __________.
2. The second one is ________.
3. The third one is __________.
4. The fourth one is _________.