按要求完成下列句子。

1. She's never been to Tokyo. (改为反意疑问句)

    She's never been to Tokyo, ______ ______?

2. It'll be sunny tomorrow. (改为反意疑问句)

    It'll be sunny tomorrow, ______ ______?

3. The boys were having a math class at this time yesterday. (改为反意疑问句)

    The boys were having a math class at this time yesterday, ______ ______?

4. Go across the bridge, and you'll see the hospital. (改为同义句)

    ______ the______, and you'll see the hospital.

5. This book cost Peter 5 yuan. (改为同义句)

    Peter ______ 5 yuan ______ this book.

月掩星、凌日等天象能发生，是因为行星、月球的公转轨道平面彼此偏角很小。