把下列句子改成单数或复数句（小学五年级）
Here's a map of China for you.
4.They have some fruit.
5.There is a bus in the picture.
6.Are they English doctors?
最后问一个问题!The girl (in white)is my sister.这句句子要求对划线部分提问（就是括号内）,可是要怎么问?