—It’sawarmday,isn—’Yes,tit?it’s__________cold.Ijustwearajacket.

设A为5阶方阵，且r(A)=3，则线性空间W={x|Ax=0}的维数是______________.

出口贸易是我国引进技术和利用外资的物资基础，制约着我国现代化建设的规模和进程。()

I______goingforawalkaftersupper.Doyouwanttogotogetherwithme?

I'msorryI'veforgottentopostyourletter.

—Nevermind._____postitmyself.