词汇运用
⑴No one is____ （允许）to drive after drinking.
⑵As soon as I arrived in Hong Kong, I sent a ____ （信息）to Mum.
⑶About two hundred people ____ ( 死 )in Ya'an Earthquake on April 20^th .
⑷The moon light shines in ____(通过) the window and the room seems quiet and beautiful.
⑸The teacher spent a long time ____ (解释)the problem to the boys after class.
⑹Now Father's Day becomes very popular. It is on the ____ (three) Sunday every June.
⑺Teenagers should be encouraged to make decisions by ____ (they).
⑻It's much ____ (sun) this weekend. Why not go camping, David? ——Sounds great.
⑼Everyone likes Mary in our class because she always talks to others____  (polite).
⑽The telephone was one of the most important ____ (invent) of the 19th century.

阅读图文材料，完成下列要求。

2016年1月21日～23日，一场“霸王级”寒潮侵袭了我国大部分地区，致使我国部分地区的越冬农作物遭受冻害，华北地区的大量冬小麦受损严重。下面为华北地区某冬小麦农田和冬小麦受损景观图。说出本次寒潮对冬小麦造成的主要危害，并列举冬小麦防治冻害可采取的工程措施。

若方程组$\left\{\begin{array}{c}a+b=3\\ b+c=2\\ c+a=1\end{array}\right.$的解满足k=a+b+c，求关于x的函数y=kx﹣k的解析式．