This is ______ key and that is ______ eraser.
—Jim, who taught ________Chinese before you came to school?—Nobody. I learned it by _______.
—What do you think your life will be like________ twenty years?—Yeah.I have thought about it________ three years.
―I think it’s too late to say sorry to Kate.―Never mind. _______.
----May we leave the classroom now?----No, you . You to leave until the bell rings.
He hasn’t decided _______ to go by bus or by train.