—Excuse me， ____ is the post office?
—About 500 meters away.
A．how often B．how long C．how far D．how soon
—Where ____ you ____ lunch?
—At home．There was no school lunch
A．did；have B．are；having C．will；have D．do；have
I'm not sure about the meaning of the word. You'd better look it up in a ____ ．
A．letter B．dictionary C．postcard D．notice
Trees ____ fight air pollution．They are natural air conditioners．
A．should B．must C．need D．can
____ it snowed heavily yesterday, nobody in our class missed the lesson．
A．Though B．Because C．Unless D．Since
Tomorrow there's a programmed about our school on TV，then it ____ by millions of people．
A．will see B．saw C．will be seen D．was seen
