What makes the space shuttle _____ is that it takes off like a rocket but lands like an airplane.
It is _______ that the pork with the “lean-meat powder”(瘦肉精)has been widely _______ all over the country.
---- Look! Everything here is under construction. ---- Oh, has the building once ___ for exhibition been pulled down, too?
—You seem to show interest in cooking. —What?_________, I’m getting tired of it.
We allowin the woods but anyone is forbidden here.
He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.