A: What’s the matter, Sara? You wear a sad look on your face. B: Oh, nothing much. As a matter of fact, I _______ of my friends back home.
____time,Chinese farmers have invented many farming techniques.
When he ran downstairs, he tried to avoid ____by the teacher.
Books of this kind ______ well.
Her parents asked her ______ her work.
Sea water _____ many minerals, salt _____.