Deserts, dry areas with _____ no vegetation, cover more than one-third of the Earth's land surface.
An idea suddenly came to J.K. Rolling ________ she could write a book about people living in the magic world.
Andy and Ben both study ________ but they hold opposite ________ views.
China has long been a leader in the field of genetic research ________ improving agriculture.
You lent him $10,000 yesterday? You must ________ by him!
— How do you find the food here? — _______.