他的奇怪行为让所有人都感到困惑不解。

His strange behavior ___confounded everyone.

他出人意料的成功让所有怀疑他的人都哑口无言。

His unexpected success ___confounded all those who had doubted him.

复杂的数学题把学生们都弄糊涂了。

The complicated math problem ___confounded all the students.

他的实验结果完全出乎意料，彻底推翻了专家们的预测。

His experimental results completely ___confounded the experts' predictions.