Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
The climate in Chengdu is warmer than______in Harbin.
I ______the paper before my lawyer explained the details to me.
Having arrived too early for the appointment, Robert decided to read the newspapers ______ time.
______her dark sunglasses, the star wasn’t recognized by crazy fans.
You ______get this book free if you can tell me the name of the writer.