我尽了最大努力说服他。

I ___did ___my ___best to persuade him.

我会尽最大努力完成工作。

I'll ___do ___my ___best to cover the work.

考试时尽你最大努力就好；大家只能这样要求了。

Just ___do ___your ___best on the test; that's all anyone can ask.