The old man is so angry. He can’t say a word.（连成一句）
The old man is ______ ______ ______say a word.
I bought the bike ten years ago. (同义句)
I ______ ______the bike ______ ten years ago.
The key is used for locking the front door.（就划线部分提问）
______  _______ the key ______for?
You should hang the curtains across the stage.（改为被动语态）
The curtains _______ ______ ______across the stage.
Our school has changed greatly in the past several years.（同义句）
There ______ ______ great changes in the past several years.