他费力地举起沉重的箱子放进了后备箱。

He ___hefted the heavy box into the trunk with effort.

这个小箱子的重量让我很惊讶。

I was surprised by the ___heft of this small box.

他在购买前先掂了掂那袋苹果的重量。

He ___hefted the bag of apples before buying them.