tamper|tampered|tampering

有人被抓到在考试成绩上做手脚。

Someone was caught trying to ___tamper ___with the exam scores.

有人篡改了投票箱里的选票。

Someone ___tampered with the ballots in the voting box.

他因篡改比赛成绩而被取消参赛资格。

He was disqualified for ___tampering with the competition results.