她跪在孩子旁边。

She ___knelt down beside the child.

他跪在祭坛前祈祷。

He ___knelt in front of the altar and prayed.

罗伯特跪在她身边，说出简单的话语：“你愿意嫁给我吗？”

Robert ___knelt down by her, pronouncing the simple words "Will you marry me?"