函数$f\left(x\right)=x^3+a{x}^2+3x-9$，已知$f\left(x\right)$在$x=-3$时取得极值，则a=（   )

繁重      沉重

①____的工作压的他喘不过气来。

②工人们也____地叹着气。繁重沉重

指示      批示

③工程师____未来的路要铺在哪里，工人们往土里埋进排水管。

④按照领导的____，他们很快做好了一切准备工作。批示指示

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词。

2）只允许修改10处，多者（从第11处起）不计分。

    Last Saturday, I, with a friend of mine, were having a picnic in a park when it began to rain heavily. We packed everything up rapid and were ready to leave. My friend, her hair was already wet, suddenly couldn't move and speak. Her eye were rolling and she was about to lose consciousness. I was so frightening that I didn't know how to do. Luckily, a woman on a bicycle appeared. Struggle with the rain, she managed to call an ambulance. My friend has recovered the next morning. I am so grateful for the woman. But I haven't even got chance to thank her.