imbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______.

_______ make a fire with me They are waiting for us to cook over there.

My grandfather has a large __________ of stamps.

Why do you always go to Zhejiang University on weekends— Because there’re lots of great speakers I can practice English in the English Corner there.

That art center is _______ used to be a factory, ______ millions of tractors were produced.