根据句意和汉语提示，填写恰当的短语完成下列句子。

1. In Switzerland it's very important to be        (准时).

2. They        (握手) and started a conversation at once.

3. Don't be angry with him.        (毕竟), he is still a child.

4. They don't usually have to          (做计划) to meet their friend

5. He lives near the city mall. We can        (顺便拜访他家) when we go there for shopping.

太阳不象地球，它没有全球性的偶极磁场，不过通常太阳两极的磁性是不同的，并且在每个太阳活动周期中，大约当太阳活动达到峰值时，两极磁性会发生转换。这种转换并不会给地球带来显著的直接影响。结合所学知识，回答下列问题。

太阳活动会引起地球大气层扰动而导致（）

A.“磁暴”现象

B.极光现象

C.无线电短波通讯衰减或中断现象

D.耀斑现象