她的成绩单清楚地证明了她在学业上的努力。

Her transcript ___attests to her hard work in academics.

我可以证明他在会议期间一直很专注。

I can ___attest that he was fully focused during the meeting.

律师将见证这份遗嘱的签署。

The lawyer will ___witness the signing of this will.