We’ll have to work extra hours, for there are still some problems ____________ .
When the invader arrived, millions of people ____ from their homeland.
They are ___ the old houses in order to set up a new teaching building.
You should ___ the students instead of just telling them what to do.
It has rained for a whole day.But I think it's going to ___.
Her husband had ____ a large business during his lifetime.