他头痛并发高烧。

He's got a headache and a high ___fever.

我了解到她独自和弟弟在一起，他发烧了。

I understood that she was alone with her brother and he had a ___fever.

如果你发烧了，应该休息并多喝水。

If you have a ___fever, you should rest and drink fluids.