We should tell hunters _______tigers.

The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.

下列句子中“而”字的用法与例句相同的一项是例句：冰，水为之而寒于水

26.—Did your father come back early last night?—YesIt was not yet eight o’clock ______ he arrived home

It was not until dark ______ he found that it was the correct way to solve the problem.