In summer milk will quickly go bad _________ it is put into a fridge (冰箱).

下列句子中，加横线词语的用法不同于其他三项的是（ ）

Do you like playing football—Yes. And young people are good at playing football.

These days some young people just ________ work hard because they have got used to the easy life provided by their parents.

“The workers are working on the farm now.” The main structure of the sentence is .