阅读理解。 The teacher is giving his students a written examination. He wants them to write a composition (作文). The title is My Dog, no less than 150 words. Little Tom thinks for a moment, then he begins to write, 'I have a dog. I call him Bobby. I like my dog. He is all black, only the nose is white...' Tom stops writing for a moment and continues, 'Every day I take Bobby out for a walk. He likes having a walk, and I like giving him...We both like it.' He counts (数) the words: 67. Tom scratches (抓) his head, looks out of the window, looks at the blackboard and continues, 'Bobby likes sugar, so I often give him some sugar. But sometimes we do not have any sugar in the house, and then I do not give him any...' He stops for a long time. Suddenly a thought strikes (敲,打) him. He smiles happily and writes quickly, 'When I want Bobby to come, I call 'Bobby'. If he doesn't come, I call again, 'Bobby!' 'Bobby!' If he still doesn't come, I just call 'Bobby! Bobby! Bobby!'' Tom counts the words: 149. He adds one more'Bobby' and writes his name at the bottom of the paper and hands it in to the teacher. 1. The teacher w______ the students to w______ a composition. 2. Now Tom is at s ______. 3. Tom doesn't t ______ hard w ______ he writes the composition. 4. There is a d ______ in T ______ home. 5. At l ______, Tom a ______ a word 'Bobby' in his composition.