The lack of one basketful of earth spoils the entire effort to build a nine-ren mountain.

为山九仞， 功亏一篑。

He sent us a basketful of apples yesterday.

昨天他送给我们一篮子的苹果。

Her sister-in-law bought a basketful of apples.

她的弟媳，买了一篮苹果。

When gather it grain by grain, we soon have a basketful.

等到我们一粒一粒地把它们聚集，很快就集满一筐。

Better one grain of pepper than a basketful of pumpkins.

附：“一粒辣椒也比一篮南瓜好”，意思是重质不重量。