------Is there anything wrong , Bob? You look sad. ------ Oh, nothing much. In fact, I ______ of my friends back home.
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?