—Hello, may I speak to Millie, please?—________.
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—I am going to Sanya for my holiday tomorrow.—_____________.
— Look! The girl ______ long hair is making a snowman. Is she Sandy?— It _______ be her. I’m not sure.
The Maths problem is so difficult that _______ students can work it out.
It’s quite cold outside, you had better _________the windows.