A:Every dog has its day.
B:A new broom sweeps clean.
C:A cat may look at a king.
D:A person is known by the company he keeps.
补写出下列句子中的空缺部分。
玛雅文明是什么时候消失的( )
满足方程组4x+my=23x+y=12的一对未知数x、y的值互为相反数,则m值为( )
—What's your new home like?
—_______________________.