In this task your given two statements in Chinese. You must judge whether the second sentence is the cause or effect of the first one. Label the instances as "cause" or "effect" based on your judgment. The sentences are separated by a newline character.

Q: 那人很伤心。
他的妻子离开了他。

A: cause
****
Q: 飞机遇上了一些湍流。
那人系紧了安全带。

A: effect
****
Q: 孩子的鞋带解开了。
他在操场上跑来跑去。

A:
cause
****