-When did you come back to Enshi?-____the aftemoon of May lst.A.On B.At C.In
At the foot of the hill you could hear nothing but the_______ of the running water.
— 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.