句型转换
按要求转换下列句子，并将答案写在相应的横线上。
These apples are 9 dollars. (对划线部分提问)
__________________________________________________________？
This child is a good student. (改为复数形式)
__________________________________________________________
Jack eats salad for breakfast. (改为一般疑问句)
__________________________________________________________？
He has many friends. (改为否定句)
__________________________________________________________
Do David and Tom like bananas?（作肯定回答）
__________________________________________________________