根据所给汉语提示，写出空缺处单词正确形式。

1. Can he _____ (募集) enough money to go to the college?

2. It is _____ (重要的) to clean the classroom every day.

3. He is very _____ (贫穷的), so he can't send his children to go to school.

4. There were many poor families in the_____ (农村地区) in 2000.

5. His mother is _____ (生病的), so he have to look after her at home.

小儿充血性心力衰竭发病率最高的年龄段是（）

A.12～14岁

B.1岁以上

C.5～7岁

D.1岁以内

E.2～3岁