小题1:The old man is so angry. He can’t say a word.（一句） The old man is ______ ______ ______say a word. 小题2:I bought the bike ten years ago. (同义句) I ______ ______the bike ______ ten years ago. 小题3:The key is used for locking the front door .（就划线部分提问） ______  _______ the key ______for? 小题4: You should hang the curtains across the stage.（改为被动语态） The curtains _______ ______ ______across the stage. 小题5: Our school has changed greatly in the past several years.（同义句） There ______ ______ great changes in the past several years.