写出下列句子的同义句。 1. My brother is interested in playing the piano . My brother _____  _____  _____  _____ playing the piano. 2. He doesn't go to work by bus. He goes to work by bike instead. He goes to work _____  _____  _____  _____  _____  _____. 3. She is so upset that she can't believe anyone. She is _____  _____  _____  _____ anyone. 4. He didn't come to school because he was ill. He didn’t come to school _____  _____ his illness. 5. The story is too difficult to understand. The story is _____ ____  _____ to understand.