grasping

他那贪婪的本性让朋友们都疏远了他。

His ___grasping attitude drove all his friends away.

婴儿紧紧抓住妈妈的头发不放。

The baby kept ___grasping his mother's hair tightly.

小孩子很难理解这个复杂的数学问题。

The child had difficulty ___grasping this complex math problem.