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单词填空。根据句子内容和所给首字母填入适当的单词。 1. Mike usually goes to school by bus, but today he goes by b______. 2. The 2008 Olympic G______ will be held in Beijing. 3. Bill says he wants to j______the army when he grows up. 4. A stranger was knocking at the door, but she was afraid of l______ him in. 5. Her mother became s______ ill and had to be sent to hospital at once.