四道初中英语单词变形体1.The Palace Museum has a large ____(collect).People can learn a lot in it.2.When the fire happened,the firemen hurried there and carried the children to ___(safe).3.the * has made great contributions to the ___(develop) of the world's high speed railway.4.Last month,I took my first direct ____(fly) from Shanghai to *.=====请解释一下变形的原因.

四道初中英语单词变形体
1.The Palace Museum has a large ____(collect).People can learn a lot in it.
2.When the fire happened,the firemen hurried there and carried the children to ___(safe).
3.the * has made great contributions to the ___(develop) of the world's high speed railway.
4.Last month,I took my first direct ____(fly) from Shanghai to *.
=====
请解释一下变形的原因.