他整个下午都在埋头苦干完成报告。

He ___slogged all afternoon to finish the report.

士兵们在暴雨中艰难地跋涉了五公里。

The soldiers ___slogged five kilometers through the heavy rain.

期末考试前的最后一个月真的是段苦战。

The final month before finals was a real ___slog.