Trees can prevent the wind _____ towards the rich farmland in the south.A. moves B. to move C. from moving
— Aren’t Sam and Helen in Class Three? — _______.
Sam with his friend Helen _______ in Class Three. They are in Class One.
It’s important ______ people to understand each other.
Bob is _______ an English class. His teacher is talking ________ English.
— ________ your friend? —The boy in front of the old man.