1.Let's have some spring rolls.(同义句）
Shall we have some spring rolls?
2.This plate of fish cost me 30 yuan.
How much did this plate of fish cost?
How much are this plate of fish?
3.She needs to do some exercises.（对划线部分提问）（do some exercises是划线部分）
What does she need to do?
4.I told him the news on the phone.(划线部分提问)(on the phone)
How could you tell him the news?