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I ________ the room yesterday, so it is not dirty today.

A. clean B. cleaned

C. will clean D. is cleaning

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What should you take in with you when you take an exam? Pen, pencil, eraser, ruler…, and don’t forget a bottle of water!

According to a study at the British Psychological ( 心理学的) Society Annual Conference held in London, students who bring water into exams may improve their grades by up to 10 percent.

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