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.

[EX Q]: 大楼被疏散了。
火警响了。
[EX A]: cause

[EX Q]: 赛跑者感觉到他的竞争对手在逼近。
他加快了步伐。
[EX A]: effect

[EX Q]: 舞台上的帷幕拉开了。
演出的第一幕开始了。
[EX A]:
effect