中国大学MOOC: I think of my father when I complain _____ trifles.

You metabolic rate is the speed at which your body ______ food into energy. A: trifles B: trembles C: transforms D: triumphs

Recently the young couple has _________ arguments with each other for trifles. A: perpetual B: eternal C: constant D: continual

I think of my father when I complain _____ trifles. A: about B: to C: on D: in E: through F: at