Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
Through English we will be able to communicate _____ part of the world we come from.
She looks quite young _____ her age.
Whether by accident or _______, he arrived too late to help us.
—Do you know where my blue coat is ? —Don’t bother to look for it. I’m sure it will________ some day.
— I didn’t do well in the exam. What about you? — I did _____ you. Maybe even worse.