If people eat natural poisons by mistake, they _____ go to hospital without delay.
It’s no use____ that you didn’t know the rules.
At a rough estimate(估计), Nigeria is ____ Great Britain.
In face of _______ failure, it is the most important to keep up ________ good state of mind.
Most of the factories under___________ have been designed by Chinese engineers.
____________he came from the countryside, he became a modern architect.