根据句意和汉语提示，填写恰当的短语完成下列句子。

1. ___________(根据) the weather forecast, there will be rain in most parts of China.

2. Yesterday I took Jenny’s dictionary home ____________(错误地).

3. Boys and girls, be careful enough not to____________(落入) the lake.

4. In our free time, I taught her Chinese and she taught me English. ___________(用这种方式), both of us learned a lot.

5. — Why did you come home so late this afternoon?  

    —I met one of my old friends in the street _____________(意外地) and we had a long talk.

读图a、b、c分别表示0～14岁、15～64岁、65岁及以上三种年龄人数占总人口的比重，据此回答问题。

小题1:图中①、②、③、④四个国家中，老龄化问题最严重的是（  ）

A．①

B．②

C．③

D．④小题2:图中②国0～14岁年龄人数所占总人口比重大小及应采取的相应正确措施是（  ）

A．70％  鼓励生育

B．60％  计划生育

C．15％  采取移民政策

D  30％  鼓励人员出国