The houses in big cities are very _______. I can’t afford（负担）them.

Study harder, and you _______ better grades.

I can’t decide which colour to choose. Maybe blue looks good _____ me.— I don’t think so. I’m sure you look more energetic _____ red.

Why are you going there now?— Why? At least_____ him leaving. [ ]

collected plenty of historical evidence, provedthat humans used to have different sleeping patterns