下列词语中加点的字，每对读音都不相同的一组是

He is a good example _________ we can use to inspire our students.

I don’t think David could have done such a stupid thing last night, ?

leaving for the States tomorrow for aholiday, Caroline!—

When I _______ in the kitchen, nothing mademe feel better than preparing the eggs and serving them just the way thecustomers wanted.