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—Kathy and her sister are so alike.
—I can’t tell one from ____.

The weather of this year is not so good as        of last year.

There are many choices to make in life but _______ is more important than what goes on in your heart.

One side of the board should be painted yellow, and _______ white.

I would appreciate ______ if you could give me a reply as soon as possible.

September 8th，1931 is a special day，________, I think，that will be remembered by the Chinese forever.

Many people like to talk about generation gaps. I don’t think there is       in my family, though.

The fire made _____ difficult to rescue the people trapped under the ruins in the earthquake.

October 1, 2009 is a special day, ________ I think, that will be remembered by all the Chinese forever.

I find      important to have some communicative skills.