--Mary’s crying sadly in her room. Why must you say so to her?
--I know I’ve hurt her, but it wasn’t my      .

下列实验操作能达到实验目的的

当你想知道对方看到了什么时，可以问：What do you see?

—Many people are worried that so many college graduates each year can’t find a job.
—There is no need to worry about it as the government is now making every____________to provide more jobs.

已知向量 $\overrightarrow{a}$ 、 $\overrightarrow{b}$ 满足| $\overrightarrow{a}$ |=1，| $\overrightarrow{b}$ |=2，则| $\overrightarrow{a}$ + $\overrightarrow{b}$ |+| $\overrightarrow{a}$ ﹣ $\overrightarrow{b}$ |的最小值是____，最大值是____．