民主党候选人、现任副总统卡玛拉·哈里斯与共和党候选人、前总统唐纳德·特朗普展开激烈竞争。

Democratic ___candidate and current Vice President Kamala Harris is in a fierce ___contest with Republican ___candidate and former President Donald Trump.

他是这个职位的最佳候选人。

He is the best ___candidate for this position.

所有考生必须在考试开始前半小时到达考场。

All ___candidates must arrive at the test center half an hour before the exam starts.