按要求改写句子。
1. I'm shorter than he is. (改为一般疑问句)
_____ _____ shorter than _____ _____?
2. This book is not as interesting as that one. (改为同义句）
That book is ____ _____ _____ this one.
3. Tom is thinner than Sam. (同上)
Sam is _____ as _____ _____ Tom.
4. I'm athletic. He is athletic, too. (合为一句)
I am _____ _____ _____ he is.
5. He likes swimming. She likes it, too. (同上)
They _____ _____ doing _____ _____ thing.
应该采用（）.