Mom used only half of the money, the rest of which ______ saved for other purposes.
It was the dream of becoming rich _____ attracted people from all over the world to the state, ______ gold was discovered in 1848.
Peru, a country ____ the Pacific coast of South America, gained its independence ______ Spain in 1821.
All witnesses _____ to the traffic accident are required to make their statements.
He apologized for ____able to inform me of the change about the plan in advance.
—Li Ping, your cousin speaks fluent English, like a native speaker. —No wonder. He once _____ in New York for two years as a visiting professor.