People in North China eat noodles as their main food ___ people in the south eat rice.A. as B. while C. when
—Do you know who the pen_______? —Sorry ,I don’t know.
They preferred ________ in bed rather than ________ horses.
—Could you pass me _____glass on the table please?—Sure, but it’s _____empty one.
— How do you study for a test? — I study _____working with a group.
—Would you like to drink some juice? --Thanks. But________. I have drunk a lot of tea.