目击者将在法庭上作证，陈述他所看到的一切。

The witness will ___testify in court about everything he saw.

她的快速康复证明了这种新药的有效性。

Her quick recovery ___testifies to the effectiveness of the new medicine.

这位牧师在布道时公开见证了自己的信仰转变。

The pastor ___testifies to his spiritual transformation during the sermon.