Worst,cheaply,carefully,comfortably 各造句

第一个有多种意思认真地 第二个便宜的
严肃地
严重地

Mary doesn‘t know where to buy books cheaply.

cheap做副词是口语,习语go cheap
cheaply做副词才是正式的,习语get off cheaply

The book is cheap.
I have found the place that fruit is cheaply bought
She listened to the video carefully.
You must be careful when you talk to the strangers.

cheaply是副词,修饰动词.用cheap可修饰clothes: you can buy the cheapest clothes here.

两者均可表示“便宜地”、“廉价地”,但前者主要与表示“买”(如buy,get,pick up等)或“卖”(如sell)之类的动词连用,且置于其后;后者用法较广,可置于动词之前或之后.如：
He sold it cheap [cheaply].他卖得很便宜
The radio was cheaply bought [was bought cheap].这收音机买得很便宜.
The room was cheaply furnished.屋里配置了便宜的家具.
The bus takes you there cheaply.坐公共汽车去便宜.
We mustn’t sell our goods so cheaply.我们的货不应该这样便宜地卖.
I got them quite cheaply.它们我买得很便宜.
There you can play golf comparatively cheaply.在那里打高尔夫球比较便宜.
They told us where to shop cheaply.他们告诉我们在哪里买东西便宜.
Such vaccine can be mass-produced cheaply.这种疫苗可以便宜地大批生产.