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: 锁开了。
我转开了锁里的钥匙。

A: cause
****
Q: 我把一枚硬币扔进喷泉里。
硬币沉到底部。

A: effect
****
Q: 我想节约能源。
我把空房间里的灯关了。

A:
effect
****