It is rather ______ that we still do not know how many species there are in the world today.

 John is very _____---if he promises to do something he’ll do it.

Driving a car without insurance can have _____ consequences.

—Will you be _____ this afternoon, John?—It depends. I’m afraid I’ll be called in by my manager.

This bird is really lovely， and I’ve never seen ______ one.