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D. an; a 
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remembered he didn't wash his hands. He went back to his office and put his coat on the chair. Then he washed his hands and left. However in the restaurant, he found he forgot to wear his coat. All his money was in one of the pockets. He got up and went back to the hospital. He ran to the lift but it was going to close. He put his head into it, and the doors opened. A man in the lift said, "Oh, dear sir! Why didn't you hold the doors open with your hands? It's too dangerous to do so with your head!"
omework every day and exams are usually a big problem to them. Sometimes, a few even have to go to evening classes after school.