1.I can't evaluate（评价） his ability.
2.The effect of the speech was diluted（冲淡,变弱） by the speaker's nervousness.
3.The soldier's courage was such that he was always in the midst of the fight.
4.He is a very promising（有前途的,有希望的） young man.
5.We've exhausted this subject：let's go on to the next.[我想我们已经详尽无遗地讨论了这一问题,我们接着谈下一个吧.]
6.John is a very competitive（有竞争力的） person.
7.Do you agree with me that Christmas is too commercialized（商业化的） these days?
---绝对正确!