她走得太快了,我跟不上她。
She was walking so fast I couldn't ___keep ___up ___with her.
不幸的是,他太快了,我无法跟上他。
Unfortunately he was too fast and I couldn't ___keep ___up ___with him.
在马拉松比赛中,许多跑者觉得很难跟上节奏。
During the marathon, many runners find it hard to ___keep ___up ___with the pace.