cheap的副词形式是什么

　　Every voice can be heard cheaply and instantly.

　　每一个声音都可以很容易的`立马被听到。

　　Can it be made cheaply enough for poor countries?

　　其生产成本对贫困国家而言是否足够低廉？

　　These firms could deal more cheaply and in greater size.

　　这些公司的进入使得交易更便宜，规模更大。