--- How do you like your math teacher?--- She is strict __________us.A. with B. in C. at
—Could you help me________the heavy bag? —Of course.
You didn’t go there,________.
When I got home,my son________music.
My mother________while my father________TV.
—I called you at 8:00 yesterday evening,but there was no answer. —Oh,I’m sorry.I________dinner at my friend’s house.