A good teacher is ______ who teaches not only with mind but also with heart.
I would appreciate ______, to be frank, if goods could be delivered as soon as possible.
I’ll be publishing my results only when I have _________ my research.
—What do you think of Spain?—Well, considering its diverse cultures, it is an attractive country,______ worthy of a visit.
____ enters the computer rooms should take off his shoes in order to keep them clean enough.
I just wonder ______ that makes him so excited.