句型转换。

1．You need to change your mind.(对画线部分提问)

      ___  ___ I need to___?

2. Sara couldn't catch his. words because he spoke too quickly.(对画线部分提问)

    ___  ___Sara ___his words?

3.I learned to write my own original sentences by using grammar.(对画线部分提问)

     ___  ___you ___to write your own original sentences?

4.I don't know how I should use commas.(改为同义句)

    I don't know ___  ___  ___commas.

5. Why don't you ask your teacher for help when you are in trouble?(改为同义句)

    ___  ___ ask your teacher for help when you are in trouble?

肱骨干骨折愈合较困难的部位是：

A．上1/3

B．中1/3

C．下1/3

D．中上1/3

E．中下1/3