Plans have been proposed ______ the largest dam in the world to be built along the Congo river.
Most middle schools prefer to buy _______ desks, so they can change to suit students’ growing height.
Maanshan is ______ most beautiful tourist site and I want to visit it ______ second time next year.
Mind your ____, and thank your friend when you leave the party.
It might be dangerous, but that’s the chance you have to ____ , sir.
I was about to get on the bus ____someone called me from behind.