--Hi, Bob. Long time no see. ____? --I've just bought a new car. It's great.
—Remember this, children. ____ careful you are, ____ mistakes you will make. —We know, Miss Gao.
There are many young trees on ______ sides of the road.
________ of them has his own opinion.
The box is_______ heavy for the girl _______ carry.
He may come,but I'm not sure ______ that.