______ lucky we are to have so many responsible teachers!
They were talking about the persons and things _______ they saw in the factory.
Not only the students but also their teacher_______ the Great Wall before.
It is impossible for ______ little children to do ______ much work within 20 minutes.
He has spent as much time as he has _______ English in the morning.
We're not sure if it _______ tomorrow. If it _______, we won't go hiking.