Mr. Lee was going to sleep when he heard the bell 1.______(ring). He turned 2.______ the light and looked at his clock. It was twelve o’clock. “Who can it be at this time of night？”he thought. He decided to go and 3.______(find) out. So he got up, put on his dressing gown (浴袍)and went to the door. When he opened the door, there 4. ______(be) nobody there. Then he went back to his bedroom, took 5. ______ his dressing gown and got back into bed.
　　A few minutes 6. ______(late), the bell 7.______(ring) again. Mr. Lee jumped out of bed 8.______(quick) and rushed to the door. He opened it, 9. ______again he found no one there. He closed the door and tried not to feel 10. ______(anger). Then he found a piece of paper on the floor. There were some words on it： "It is now after midnight, so it is April Fool’s Day. April fool to you!”