用代数式表示：面积为S的圆的半径为______．

用括号内所给单词的适当形式填空。

1. On _______ (rain) days, we'd better _______ (stay) at home to do some reading.

2. Our plan is _______ (walk) in the countryside.

3. The sun is _______ (shine) brightly at the moment.

4. There will be _______ (wind) in Shanghai tomorrow.

5. It's much _______ (wet) than it was yesterday.