按要求改写句子。 

1. They came to the hospital because she was ill. (对画线部分提问) 

    ______ ______ they come to the hospital?

2. We stayed there for a week. (同上) 

     ______  ______  ______ you stay there?

3. She hung out with her friends. (改为一般疑问句) 

     ______ she  ______  ______ with her friends?

4. We had a great time on the school trip. (改为同义句）

    We  ______  ______ on the school trip.

5. Toby did well in soccer when he was ten years old. (同上)

    Toby  ______  ______  ______ soccer when he was ten years old.

碾制下列造型材料时间最长的是（）。

A.铸钢用砂

B.铸铁用砂

C.涂料

D.铸造合金用砂