People have planted a great many trees in order to________wind and sand in the desert.[ ]

Over the past 20 years the once-sleepy fishing village ______ into an international tourism destination, with many visitors coming to explore its spectacular rainforests and beaches

The boy always looks . Now he’s looking at his new drawing.

Was it not until you began to work —— how much time you had wasted?

As a student， you can hardly avoid _________ mistakes in the exam.