5. They need three pieces of bread.(对画线部分提问）

__     bread do they need?

4. There are fifty students in his class.(对画线部分提问）

__  students are there in his class?

3. Check your answers again.(变为否定句） 

        __your answers again.

2. She leaves home at eight every day.(变为一般疑问句）

       she        home at eight every day?

1. They like tomatoes.(变为一般疑问句）  

          they        tomatoes?

5. Please cut the w        before eating.

4. How m        potatoes do we need?

3. Alice is very thirsty. She wants to d        something.

2. She wants to eat a b         very much now.

1. Mary finishes her homework f        .