用cost，price，value造句

That sofa really costs.
那个沙发很贵。
How dear the lesson costs!
这个教训代价多大啊！
Clerk wanted, able to cost.
招聘职员, 须能计算成本者。
What's the price of this one?
这一个要多少钱?
What price are you asking?
你要什么价钱?
I valued the house at 50,000 yuan.
我估计这所房子值五万元。
I have always valued his advice.
我一向尊重他的指教。
He often values himself on [upon]his knowledge.
他时常夸耀自己的知识。