toil

农夫们整日在田里辛勤劳作。

The farmers ___toil all day long in the fields.

矿工们在地下深处辛苦劳作，开采煤炭。

The miners ___toil deep underground to extract coal.

矿工们在地下矿井中辛苦劳作，每天工作12小时。

Miners ___toil in the underground mines for 12 hours every day.