改写句子 按括号中的要求完成句子，每个空格填一个单词。请将答案写在答题卡相应的位置上。
They have a lot of friends at school.（改为一般疑问句）
__________ they __________ a lot of friends at school?
The Yellow River is 5464 kilometers long.（就句子画线部分提问）
____________________ is the Yellow River?
“What do you think about the story?” the teacher asked the students.（改写句子，句意不变）
The teacher asked the students __________ they ___________ about the story.
We quickly went up to talk with the shy girl so that she wouldn’t feel that she was not welcome. （改写句子，句意不变）
We quickly went up to talk with the shy girl so that she wouldn’t feel __________ .
We shouldn’t throw away waste materials. They can be used again after processing.（改写句子，句意不变）
Waste materials should ___________ __________ instead of being thrown away.