When changing lanes , a driver should use his turning signal to let other drivers know .
It was _____ terrible earthquake and _____ number of people who were killed reached more than 20,000.
A driver should __ the road when .
With everything needed________,she declared that the party began.
—I hope the result of the exams had not been told to us. —________,why did you come here to see our teacher?
Which material can be thrown into the sea ________ on the nature of the material?