老年人相信一切，中年人怀疑一切，年轻人无所不知。

The old believe everything; the middle-aged ___suspect everything; the young know everything.

老师怀疑他作弊，因为他的答案和其他同学一模一样。

The teacher ___suspects him of cheating because his answers are identical to others'.

我怀疑这份报告的真实性，因为数据来源不明。

I ___suspect the authenticity of this report due to unclear data sources.

警察怀疑接下来还会发生更多的盗窃案。

The police ___suspect more burglaries will happen soon.