如果你碰巧见到彼得，代我向他问好。

If you ___happen ___to see Peter, say "hi" for me.

你碰巧知道她的电话号码吗？

You don't ___happen ___to know her phone number, do you?

我当然更加自信了，并且能理解任何我碰巧用英语阅读的内容，这对我在这家公司的工作当然至关重要。

I am certainly more confident and can understand whatever I ___happen ___to read in English, which is of course of the utmost importance for my work in this company.