________ rapid economic developmentand political stability over the past three decades, but with them ________some social problems.

_____ is even important _____ as the earth cooled down, water began to appear on its surface.

――Li Hua can remember 40 new words in a new way every day.――_______ it is!

They held a meeting ____ they could hear everyone’sidea

There ‘ s a near Mike ‘ s home. He often there.