Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
This is a(n) arrangement,not a permanent one.
We happen to age.
You should make of the time at school or you’ll regret.
Only by following this method .
—I’d like to go to the cinema with you,Dad? —Sorry,my darling,but the film is for adults only.