（1）如图1，纸片▱ABCD中，AD=5，S_▱ABCD=15，过点A作AE⊥BC，垂足为E，沿AE剪下△ABE，将它平移至△DCE′的位置，拼成四边形AEE′D。

选择下列词语书写全部正确的一项（    ）

A. When

B. Why

C. in

D. What

Mike: ____ is your favourite season ，Sarah?

Sarah: Summer.

Mike: ____ do you like summer?                               

Sarah: Because we wll have a party at home 0n Children's Day.       

Mike: ____is Children's Day?                                

Sarah: It's ____ Jane.