He was in hospital for six months. He felt as if he was ________ from the outside world.

The how to book can be of help to______ wants to do the job.

We may find that learning a foreign language does not have to be ____learning our mother tonguebut can in fact be as easy [ ]

t, I wonder _________ my efforts were all invain.

下列古代文化常识中，表述不正确的是（ ）