You’ll never guess who I met today — my old teacher! We _____ for 20 years

It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind，　　　　？

______ both sides accept these terms will everlastingpeace be established in this region.

His son is very naughty and has formed some bad habits.I think he should .

_____he dropped out of school? —-His family has run into financial difficulties.