Courage is a kind of quality — and that’s __________it takes to face the challenges in life.

There somany foreigners in the streets these days.– They might be runners in the Yellow River Estuary (入海口，河口) International Marathon.

How long has Robert _______ —Since 2000.

We should do such exercises in the future, I think, _____ we did yesterday

______ the farmers discovered theentrance to the secret cave in the valley—Totally by chance