TASK DEFINITION: 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.
PROBLEM: 锁开了。
我转开了锁里的钥匙。

SOLUTION: cause

PROBLEM: 我错过了公共汽车。
我上班迟到了。

SOLUTION: effect

PROBLEM: 这个男孩没吃晚餐。
他午饭吃了一顿大餐。

SOLUTION:
cause