______ acupuncture developed, the simple “bian stones” were replaced first by stone and pottery needles, and ________ by metal needles.
—I really like the modern digital camera you lent me last week. — . —And thank you very much for letting me keep it so long.
Was it from the teacher you learned about this?
Yesterday our head teacher made such an speech that we all felt .
It’s cold in here. We must have the fire day and night.
Miss Brown is having a lot of trouble with the washing machine, but she doesn’t know whom to for help.