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We should keep in mind that the earth is our only home and only by saving the environment________ourselves.
Many a student________selected to take part in the English competition,and more than one teacher________them on speaking and writing.
—I’m worrying about the coming examination.I’m afraid I cannot pass it.—________!I’m sure you’ll make it.
—Would you mind me opening the window,sir?—________.I am feeling a bit chilly.
It was half a year________my good friend returned to his hometown.