他费力地举起沉重的箱子，额头上冒出了汗珠。

He was ___straining to lift the heavy box, sweat beading on his forehead.

她在过滤咖啡时，把咖啡渣留在滤纸里。

She was ___straining the coffee to leave the grounds in the filter.

她跑步时跑得太快，结果拉伤了腿筋。

She ran too fast and ended up ___straining her hamstring.