请作出图中物体AB在平面镜MN中成的像．
根据像物关于平面镜对称，作出A点的对称点A′，同理作出B点的对称点B′，用虚线连接A′B′，即为AB的像．
如图：
– Do you know you ______to be here by 7:30 ?
--- Yes, I do.
A．are supposed
B．suppose
C．are supposing
D．supposed
When we climbed up to the top of the mountain, we were all ___________.
A．out of the breath
B．short of the breath
C．out of breath
D．short of breaths
