Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
Among customers there are different preferences __________ what is attractive.
Take your bank card with you when on a business trip,_________ can save you a lot of troubles.
—I say,the Spring Festival is coming. —__________Just occupy yoursel f in your study.
How to keep the homeless __________ with food and clothing is still under discussion.
Whenever my grandmother calls just to chat with me,I drop everything and enjoy the moment,knowing these times__________pass.