根据拼音写出相应的词语。

已知方程组 $\left\{\begin{array}{c}2x+3y=n\\ 3x+5y=n+2\end{array}\right.$ 的解x、y的和为12，求n的值．

如图所示电路，电源电压恒定不变．当S₁闭合、S₂断开时，电压表的示数为3V；当S₁断开、S₂闭合时，电压表的示数为9V，则此时I₁：I₂=____ ；  R₁：R₂=____ 。

根据课文内容选词填空。

             thick      soft        hot         hear       blind      elephant        hard

    It is a____ day. Four men are under a tree. They are all ____ . They cannot see. Then they ____  a noise. Oh, it's an____ . They touch the elephant. One touches its ear, he thinks the elephant is____ . One touches its tooth, he thinks it's ____ . One touches its tail, he thinks it's thin. One touches its leg, he thinks it's ____ . How funny!