7－5=____

函数$f\left(x\right)={\sin }^{2}x+\sqrt{3}\sin x\cos x$在区间$\frac{\mathrm{\pi }}{4},\frac{\mathrm{\pi }}{2}$上的最大值是（   ）

用20分度的游标卡尺测量一个物体的长度，得到图1所示，读数为____ cm．

用螺旋测微器测量金属丝的直径，从图2中读出金属丝的直径为____ mm．

地理分界线一般位于地理要素或地理综合特征变化梯度最大的地带，读图，回答小题。

    The class is over. The children are playing sports in the playground. Peter likes____He is with other two boys now. Kitty is____. Jill is good at____. Look, she can jump high. Lily is ____. Everyone has a lot of fun. Sports help keep them ____and____